I'm a big fan of the Pt Chevalier RSA, which always has great entertainment on - and this seems to be much more frequent than at most other RSA venues. Often there are Sunday afternoon events with multiple bands (sometimes a $10 door charge), and they have free Karaoke on a Wednesday evening. Typically there's entertainers or bands on Friday and Saturday nights - and some others.
The Jasmine restaurant on-site has a range of really good value menu items. You can get bowls of fries for $5, or a whole range of meals with a side plate, that go from about $11 (burger with sides) to about $20 (sirloin steak with sauce and sides etc). And of course, being an RSA, the bar menu prices are inexpensive too.
So this is a great place to come for bands, beers, and burgers! Families welcome, kids are generally fine as long as they're out of the venue by about 8pm or so. You can sign in on the day for temporary (free) entry if not a member, or a yearly membership which is reciprocal with other RSA's is about $40 per year - this gives you access to prize draws and other club benefits / newsletters etc.