My best friend is getting married on October 9th, and she had two bridal showers. She registered once and didn't invite the same people to both showers. It's pretty common now, I think. She had one shower with her friends and one with family. I went to both because I wanted to. I don't think it's tacky. You don't even have to tell people you're having more than one unless they ask. I would just register for a lot of stuff!