I am in EST (UTC-4) and my weekend availability is 9-24, so that is in UTC [13,+04]
Converting the stated ranges all into UTC range I get (if I did not make a mistake):
Weaboo [7,22]
MasterWalks [2:30,9]
Pizzazz [0,3] [14,+02] [14,23]
Wyand [7,23] [9,20]
Zso [13,+04]
Oa did not say time range but time zone is similar to Wyand
Serprex did not say range, but time zone same as Weaboo.
So if I compose intersections of ranges, I see one range with 5 player availability that is UTC [14,20] range.
Other than this, I only see max 2 player availability long enough for a tournament.
So allocating 3 hours for the tournament that would mean a starting time between 14 and 17 UTC only.
That's a pretty limited choice, wow