Fun with Friends-on the cheap!

Whenever we are feeling the pinch of our budget, I sometimes feel like "Whoa is me, I get to have no fun". Then I have a game night. I've only done this a couple of times but it really is a lot of fun. There are a few of us that get together at one house (we try to alternate) and eat dinner and play games. This would be perfect for couples but we usually just have ladies. It's great to sit around with friends and relax and chat. It's also great because we don't have to hire a sitter (the kids come and play together or stay home with Daddy), we don't have an expensive food tab (the host cooks dinner, something cheap and easy), and it is lots of fun!
I read over at www.moneysavingmom.com about a cooking club. I think this is a great idea! Basically, a group a friends get together once a month and trade frozen dishes. You would make enough dishes for everyone to take one (i.e. 8 friends, 8 dishes). This would really fun if you incorporated themes, like Mexican food in May, pie in November, cookies in December, etc. I will definitely be working on my friends to start a cooking club.
What ways do you have "grown-up" fun on the cheap? We are always talking about how to entertain our kids for less but us parents need some fun too! Post your comments so we can all learn from your ideas!