Manifest X is coming to DC on November 8th. Tickets available at: https://manifestxdc.github.io/
But who will go next?
Question will resolve to which city or region hosts the next Manifest X event by the end of 2026. If there are none, "There is no other Manifest X by the end of 2026" will resolve yes.
Pedantic quibbles:
- Suburbs and nearby commuter cities would count as part of the larger city for purposes of this question (i.e. Baltimore would count as "DC", Oxford would count as "London") 
- When suggesting answers try to give areas containing between 5 and 25 million people. (i.e. "The Baltic States" as opposed to "Riga", but not so broad as "Scandanavia" instead of "Sweden") 
- First submitted reasonably qualifying answer will win, don't Price-Is-Right snipe. (i.e. if someone suggests "Sweden", and someone else adds "Stockholm" later, "Sweden" wins.) 
- I'm ruling out events at Lighthaven, regardless of the name. Don't go rebranding "Minifest" to win a market, @Austin.