Session timing is always going to be tricky given the international flava of the group, however starting at 7:30pm might be a little early for our American friends?
For me the earlier I can make it is 8pm, when my son goes to bed, but I know others have different constraints too.
Tough call, but speaking as a guest and not a host, I think a session that runs from 7:30 to 10:30 (or 7:45 to 10:15?) would be awesome and give the best of both worlds to guests of the most popular time zones
Best,
Mike