Activity for Crystal

I'm leaning more towards a bridesmaid dress and something a bit more laid back. I just asked my fiancé about a purple dress and he seemed excited, so now I hunt.

I'm not sure which makes more sense for a long informal reception of 30-40 people. There will also be bottled water but no alcohol will be served. I also don't know how many different types of soda to offer. I know my fiancé can only drink certain...