Well, in Singapore, you'll probably just team up with a charity of your choice and then run the event. That removes any legal obstacles. I think it's the same in aussie. For your prize pool, you can just approach a previous sponsor that supports your charity (the prizes won't be that big) so those that join can have the freedom to give as they please. Also you can have strategy workshops, spectator are, a beginner's centre etc... if it's an online thing then donations would be made through paypal and your sponsor would be providing bandwidth and hosting (which costs nothing to them).
Lucky enough, Australia doesn't have any legal rules in regards to that :P
At first I was against it because having so many kind of makes me think they would lose impact and people would stop donating, but then I read the post before judging it (quite an achievement for me) and I actually think it's a great idea.
Also a lot of people act as if SC2 tourneys are charity events so the transition should be smooth.
You could name each event after the charity to further increase awareness, and have people vote on which charity to support next!
A LAN place here held a tourney where entry fee went into helping the QLD flood appeal and that was good, this is similar!
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