There are a few other people in Europe & other time zones interested, too. Maybe someone could create a "mirror" event several hours earlier (HASHMonsterEurope?)
In December, someone who'd never hosted a watch party before did so successfully #ChrimboKino using the "BYOM" method: just set a date, time & hashtag, & tell people to get the film any way they can (Netflix, Youtube, DVD etc), then say "Press PLAY now!" when it's time