I don't see how May, August, December would make it easier to gather everyone? And not really the need for changing the months. There'll probably always be trouble gathering everyone when there are many people in different time zones. In the summer, some go on vacations or trips etc. I think it's fine the way it is now, that also fits with Videovision events shifted by 2 months, we just need time in advance to discuss when to do Synchtubes. And if Sunday 17:30 works I don't see any problem.