I invited my BMs to get a mani/pedi with my mom and I before the wedding. Told them it was obviously not "required" in any way - just something fun we could do to relax beforehand. 2 out of 4 can come, which is great! Now I'm just wondering if I should pay for them. My inclination is no since it was something I invited them to come along and participate in and not something they had to do. Is my inclination right?