PAX West is next week, where FDev are also having a Community Meet (FDev aren't listed as an exhibitor there).
Eurogamer Expo is in four weeks, however FDev haven't announced anything regarding it yet (they were last there 3 years ago, and had an Elite Meet)
TwitchCon is in five weeks, that at least Bo is attending (Ed went last year too).
Yep those are smaller events, I think if they had a Big reveal Gamescom was the right place to do it...
Just like tonight they'll probably not even do a stream at PAX West.
There's also Paris Game week but not sure frontier has ever been there.