I know this is getting long, but I keep thinking about other things we do to make for a nicer party. Our parties start a little earlier than many (7 pm). We do that because it allows some of our friends that live just over 1.5 hours away to attend, have fun, and still be home at a decent hour.
For those that wish to, the offer is always open to sleep over. We keep clean bedding off to the side for those that do and they are welcome to join us for breakfast and coffee/tea the following morning. Again, no charge. We love to entertain and we would not charge vanilla friends to spend the night and have breakfast so we see no reason to charge our LS friends either.
That is a key distinction about our parties. We consider everyone we invite to be our friends. Since there is no monetary incentive, there is also no need for an open invitation. Our parties wind up being so fun because all of our friends are pretty much like us and all looking for the same things. That's something that will likely never happen when you have an open invitation party.

