We're having a 1:30pm wedding, serving heavy hours'd'overs (never could spell that...) and have to be out of our reception area by six. We were thinking of having a kind of casual afterparty for dinner and drinks later in the evening at a local bar most likely so we could continue to mingle with guests and well, eat

We have to leave out pretty early the next morning so the traditional post-wedding brunch isn't really an option and we get to see some of these people so rarely. What is the best way to put the word out about this? Everyone who is local or is staying in town is welcome, we know some people would have to drive home that evening. Is this something we can attach to the favors with a map and directions or is that rude? Should I add it to our website and hope people check and spread it by word of mouth? And how would we word it to make it clear that if they come, they are paying for their own drinks and food? We can't exactly afford two receptions

Thoughts and suggestions are welcome, thanks!!