Tricky one. You already have a license to sell & serve on premise, so as long as you are doing it responsibly can't see how there you could be in breach of your licence.
However the 'donations' could be seen as a sale - that's the tough one.
Those Brew on premise guys (like Barley Corn Brewers) have to pay excise on their sales, and possibly a hold a producing licence? dunno?
If you were going to go by the letter of the law, at the very least you might need to find out what the excise on your batch would be and factor that into the donation.
Would reckon if you had to go to court you'd be safe, and wouldn't worry - but if you are concerned about it and know a solicitor with some spare time on their hands, get them to check it out for you (Victorian Liquor Licensing Acts and that stuff). Doesn't hurt to get an opinion.
Personally I wouldn't worry about it - just make sure there's no coppers on the team that don't like your beer and will want to bust you!
Hopper.