We have a museum here that hosts tea parties. They make the whole thing pretty old fashioned. They employees all dress in the corsets, long dresses, hats, etc... Maybe taking that stance, and then putting flyers out inviting people for tea and a guest speaker. I'd look at a few other museum websites and see if you can get ideas off of their special events. Here is our museum's website... http://www.mchenrymuseum.org/