I am hosting a bridal shower for my sister the end of next month. I have invited about 30 people, a mix of my sisters friends and family. I sent out the invites the end of April as I know the summer fills up and I wanted to let people know in advance about the shower. I gave them until June 1 to RSVP. Now I don't know what I need to do about those who still haven't RSVP'd, do I contact them to follow up or figure that since they didn't notify me that they aren't coming? I knew that some wouldn't come because they live out of state and are only flying in for the wedding, but I would still like to for sure if they are/aren't coming.