ok, so we will try and get the Sunday thing running.
As Skrim's said, our intention is to use the same rules you're familiar with from the Sunday Rumble as those are tried and tested. (so Bo3 tournament, 8pm UTC, 30 minute timelimit on matches - although I think a shorter timelimit of Bo1 is worth considering, I'd like your opinions on that please)
Although the final plan is to have casters, referees and an organiser independent of any competitive team, to get things started as soon as possible I will probably take a role in organising (and not participating in) the initial iteration(s). In the long run we would like to see this as a true "community event" - with input from all potential participants both in terms or suggestions/requests and the running of the event. That way every clan can feel they are adequately represented, and we won't rely on individuals who can get burned out with the number of things on their plate.
EDIT: probably should forget about Saturdays too, though. In the interim period before the next big event, would people prefer to see this event running on Saturdays, Sundays or both?