Ethereum's flagship developer conference Devcon 9 (Devcon IX) is scheduled for October 11–13, 2027, in Lisbon, Portugal. The announcement was made at the closing of Devcon 8 in Mumbai and confirmed by Ethereum community member Hudson Jameson on X. Devcon 8 has concluded in Mumbai, marking the end of the current edition as organizers set their sights on the next gathering in Europe.