The KISS races seem quite popular and they run time at various times that ought to fit into both US and Europe's timezones. I'd start there.
http://kissraces.cc/race-schedule/
The Monday C/D (20:00 UTC) and the Tues Europe (ABCD) are the best fits for me. There's an iTT on Wednesdays that I might try on/off as well. The 100kms are probably not well suited for me :-0
Ta. Jlaw. Whilst the weather is pretty crap I'll do an endurance ride and a race. I'll look at kiss races. I want to get a solid 5+hours out on the road, but Zwift will be ideal until I can get outside without freezing or getting wet through. Fairweather I am