Developer Circles Leads around the world will be hosting specific in-person Build Days that you should join! Attend a local meetup to learn how to build on Facebook Developer products network, exchange ideas, and learn from other developers within your community.
Step 1: Join your local Developer Circle from Facebook.
Step 2: Find teammates and work on your submission for the global challenge.
*Check back periodically as new Build Days continue to be added to the schedule*
NEW: Enjoy photos from many of the wonderful Build Days that already took place HERE!
| Country | Circle | Day 1 | Day 2 | Event Details |
| Algeria | Algiers | August 30, 2019 | August 31, 2019 | Event Details |
| Austria | Vienna | September 7, 2019 | -- | Event Details |
| Bangladesh | Dhaka | August 2, 2019 | August 3, 2019 | Event details |
| Barbados | Bridgetown | August 11, 2019 | August 26, 2019 | TBA |
| Benin (Edo State) | Benin | August 23, 2019 | August 24, 2019 | Event Details |
| Botswana | Gaborone | August 3, 2019 | August 4, 2019 | Event Details |
| Brazil | Brasilia | August 24, 2019 | -- | Event Details |
| Brazil | Santa Rita do Sapucaí | August 9, 2019 | August 11, 2019 | Event Details |
| Brazil | São Paulo | August 27, 2019 | August 29, 2019 | TBA |
| Burkina Faso | Bobo-Dioulasso | August 24, 2019 | August 25, 2019 | Event Details |
| Burkina Faso | Ouagadougou | August 17, 2019 | August 18, 2019 | TBA |
| Cambodia | Phnom Penh | August 17, 2019 | -- | TBA |
| Cameroon | Buea | August 2, 2019 | -- | Event Details |
| Cameroon | Douala | August 10, 2019 | August 11, 2019 | TBA |
| Cameroon | Dshang | August 24, 2019 | August 25, 2019 | TBA |
| Cameroon | Yaounde | September 6, 2019 | September 7, 2019 | Event Details |
| Canada | Toronto | August 17, 2019 | -- | Event Details |
| Canada | Vancouver | September 17, 2019 | September 18, 2019 | Event Details |
| Chile | Santiago | August 8th, 2019 | -- | TBA |
| Colombia | Bogota | August 15, 2019 | Event Details | |
| Costa Rica | San José | July 26, 2019 | July 27, 2019 | Event Details |
| Egypt | Cairo | August 10, 2019 | -- | TBA |
| France | Paris | August 10, 2019 | -- | Event Details |
| Germany | Berlin | August 17, 2019 | August 18, 2019 | Event Details |
| Ghana | Accra | July 26, 2019 | July 27, 2019 | Event Details |
| Ghana | Kumasi | August 3, 2019 | -- | Event Details |
| Ghana | Takoradi | August 10, 2019 | -- | Event Details |
| Guatemala | Guatemala City | August 8, 2019 | -- | Event Details |
| Haiti | Port-au-Prince | August 3, 2019 | August 4, 2019 | Event Details |
| India | Ahmedabad | August 11, 2019 | -- | Event Details |
| India | Bangalore | August 24, 2019 | August 25, 2019 | Event Details |
| India | Bhopal | August 24, 2019 | August 25, 2019 | Event Details |
| India | Chandigarh | August 10, 2019 | -- | TBA |
| India | Chennai | July 27, 2019 | -- | Event Details |
| India | Delhi-NCR | August 24, 2019 | -- | Event Details |
| India | Dhanbad | August 30, 2019 | August 31, 2019 | Event Details |
| India | Durgapur | August 13, 2019 | August 14, 2019 | Event details |
| India | Goa | August 10, 2019 | -- | TBA |
| India | Gujrat | August 10, 2019 | August 11, 2019 | Event Details |
| India | Gujrat | August 3, 2019 | August 4, 2019 | Event Details |
| India | Hyderabad | August 10, 2019 | August 11, 2019 | Event Details |
| India | Indore | September 8, 2019 | -- | Event Details |
| India | Jalandhar | August 17, 2019 | -- | TBA |
| India | Kochi | August 10, 2019 | August 24, 2019 | TBA |
| India | Kolkata | August 5, 2019 | August 6, 2019 | Event Details |
| India | Ludihana | August 24, 2019 | -- | TBA |
| India | Mangalore | September 13, 2019 | September 14, 2019 | Event Details |
| India | Mumbai | August 9, 2019 | -- | Event Details |
| India | Pune | September 15, 2019 | -- | Event Details |
| India | Rajpura | August 30, 2019 | -- | TBA |
| India | Surat | August 18, 2019 | -- | Event Details |
| India | Tanjore | September 14, 2019 | September 15, 2019 | Event Details |
| India | Trivandrum | August 17, 2019 | August 18, 2019 | TBA |
| India | Vadodara | August 25, 2019 | -- | Event Details |
| India | Vellore | August 11, 2019 | -- | Event Details |
| India | Jaipur | August 17, 2019 | -- | Event Details |
| India | Kalyani | August 16, 2019 | August 17, 2019 | Event Details |
| Indonesia | Bali | August 24, 2019 | -- | Event Details |
| Indonesia | Bandung | August 3, 2019 | -- | Event Details |
| Indonesia | Batam | August 10, 2019 | August 11, 2019 | TBA |
| Indonesia | Jakarta | August 30, 2019 | -- | TBA |
| Indonesia | Makassar | September 8, 2019 | -- | Event Details |
| Indonesia | Malang | August 10, 2019 | -- | TBA |
| Indonesia | Medan | August 3, 2019 | ||
| Indonesia | Semarang | August 31, 2019 | September 1, 2019 | TBA |
| Indonesia | Surabaya | August 4, 2019 | -- | Event Details |
| Indonesia | Yogyakarta | August 2, 2019 | -- | Event Details |
| Kenya | Eldoret | August 3, 2019 | August 10, 2019 | Event Details |
| Kenya | Mombasa | July 27, 2019 | -- | Event Details |
| Kenya | Nairobi | August 24, 2019 | -- | Event Details |
| Lebanon | Beirut | August 31, 2019 | -- | Event Details |
| Mexico | Guadalajara | August 13, 2019 | -- | Event Details |
| Mexico | Mexico City | July 30, 2019 | -- | Event Details |
| Mexico | Monterrey | August 10, 2019 | -- | Event Details |
| Mexico | Puerto Vallarta | August 24, 2019 | August 25, 2019 | Event Details |
| Mexico | Queretaro | August 15, 2019 | -- | Event Details |
| Mexico | San Luis Potosi | August 20, 2019 | -- | Event Details |
| Mexico | Tepic | August 27, 2019 | -- | Event Details |
| Morocco | Casablanca | August 31, 2019 | -- | Event Details |
| Nepal | Kathmandu | July 27, 2019 | July 28, 2019 | Event Details |
| Nigeria | Aba | August 14, 2019 | August 15, 2019 | Event Details |
| Nigera | Abeokuta | September 6, 2019 | September 7, 2019 | Event Details |
| Nigeria | Abuja | August 9, 2019 | August 10, 2019 | Event Details |
| Nigeria | Ado-Ekiti | August 8, 2019 | August 9, 2019 | Event Details |
| Nigeria | Akure | August 15, 2019 | August 16, 2019 | Event Details |
| Nigeria | Asaba | September 6, 2019 | September 7, 2019 | Event Details |
| Nigeria | Bauchi | August 1, 2019 | August 2, 2019 | Event Details |
| Nigeria | Damaturu | August 24, 2019 | August 25, 2019 | Event Details |
| Nigeria | Dutse | August 3, 2019 | August 4, 2019 | Event Details |
| Nigeria | Enugu | August 24, 2019 | September 14, 2019 | Event Details |
| Nigeria | FUTA | August 29, 2019 | August 30, 2019 | TBA |
| Nigeria | Ibadan | August 31, 2019 | September 1, 2019 | Event Details |
| Nigeria | Ife | September 13, 2019 | September 14, 2019 | Event Details |
| Nigeria | Ilorin | September 14, 2019 | -- | Event Details |
| Nigeria | Kaduna | August 10, 2019 | -- | Event Details |
| Nigeria | Kano | August 17, 2019 | August 18, 2019 | Event Details |
| Nigeria | Katsina | August 24, 2019 | August 25, 2019 | Event Details |
| Nigeria | Lafia | August 2, 2019 | August 3, 2019 | TBA |
| Nigeria | Lagos | August 3, 2019 | August 10, 2019 | Event Details |
| Nigeria | Maiduguri | August 21, 2019 | August 22, 2019 | Event Details |
| Nigeria | Minna | August 2, 2019 | August 3, 2019 | TBA |
| Nigeria | Onitsha | September 6, 2019 | September 7, 2019 | Event Details |
| Nigeria | OSUSTECH | August 5, 2019 | August 6, 2019 | TBA |
| Nigeria | Owerri | August 14, 2019 | August 15, 2019 | Event Details |
| Nigeria | Oye-Ekiti | September 5, 2019 | September 6, 2019 | TBA |
| Nigeria | Port Harcourt | August 16, 2019 | August 17, 2019 | TBA |
| Nigeria | Uyo | August 8, 2019 | August 9, 2019 | Event Details |
| Nigeria | Warri | August 9, 2019 | August 10, 2019 | Event Details |
| Nigeria | Yola | August 10, 2019 | August 11, 2019 | TBA |
| Pakistan | Faisalabad | August 6, 2019 | -- | Event Details |
| Pakistan | Islamabad | August 3, 2019 | August 4, 2019 | TBA |
| Pakistan | Lahore | August 3, 2019 | August 4, 2019 | Event Details |
| Pakistan | Sahiwal | August 14, 2019 | -- | TBA |
| Peru | Lima | August 22, 2019 | -- | TBA |
| Philippines | Manila | August 10, 2019 | -- | Event Details |
| Rwanda | Kigali | August 24, 2019 | August 25, 2019 | Event Details |
| Senegal | Dakar | August 17, 2019 | -- | Event Details |
| Singapore | Singapore | August 17, 2019 | -- | Event Details |
| South Africa | Cape Town | August 24, 2019 | -- | Event Details |
| South Africa | Johannesburg | August 17, 2019 | -- | TBA |
| South Africa | Kimberley | July 25, 2019 | July 26, 2019 | Event Details |
| South Korea | Seoul | August 31, 2019 | -- | TBA |
| Spain | Barcelona | July 23, 2019 | -- | TBA |
| Spain | Córdoba | August 24, 2019 | -- | Event Details |
| Sri Lanka | Colombo | August 17, 2019 | -- | Event Details |
| Tanzania | Dar es Salaam | August 24, 2019 | August 25, 2019 | Event Details |
| Tanzania | Gombe | August 16, 2019 | August 17, 2019 | Event Details |
| Tunisia | Tunis | August 17, 2019 | -- | TBA |
| Turkey | Ankara | July 27, 2019 | July 28, 2019 | Event Details |
| Turkey | Istanbul | July 27, 2019 | July 28, 2019 | Event Details |
| Uganda | Kampala | August 10, 2019 | August 11, 2019 | Event Details |
| Ukraine | Kyiv | August 31, 2019 | September 1, 2019 | Event Details |
| United States | Atlanta | August 10, 2019 | -- | Event Details |
| United States | Berea | September 14, 2019 | -- | Event Details |
| United States | Jacksonville | September 15, 2019 | -- | TBA |
| United States | Montgomery | August 18, 2019 | September 2, 2019 | Event Details |
| United States | New York City | September 14, 2019 | -- | Event Details |
| United States | San Jose | August 24, 2019 | -- | TBA |
| Vietnam | Hanoi | August 11, 2019 | August 17, 2019 | Event Details |
| Zambia | Lusaka | August 10, 2019 | August 11, 2019 | Event Details |
| Zimbabwe | Harare | July 27, 2019 | August 3, 2019 | Event Details |