I don't know what to do????

I was just at my moms and we were talking about our rehearsal dinner. I was telling her that FH's dad needs to know how many people. In the midst of the conversation she asked me when the rehearsal was. I told her the Thursday night before the wedding. She then tells me, I don't know if your supposed to know this, but i think your BM's are planning your bachelorette party for that night. The Thursday before. I totally appreciate what they are doing, but, I really don't want and basically can't have it the Thursday night before. We already booked the rehearsal and there is just way too much to do two days before the wedding to go out and party all night. That means I'll wake up on Friday with a hangover and probably be sick, when I have to go and get my nails done and do last minute things before Saturday. How do I go about getting them to change the date of the bachelorette party without letting them know that I know?
My mom told me they were doing it that night because two of my BM's that live in Florida will be coming up on Wednesday and they will be able to be here. HELP!!! I don't need any more craziness and stress. There is no way I can go out two nights before the wedding and truly enjoy myself.

maybe you can suggest to your mom that she talk to them about having a 'day at the spa' bachelorette party? something nice and relaxing without to much craziness? hope it works out

Jaime tell them exactly what you said here:

You appreciate it however and then all the reasons that you listed. The 2 girls from Florida will have to understand and maybe just the girls can go out to lunch that Thurs or Friday. Don't stress I am sure once you tell them the reasons they will understand!

Why not have a toned down bachelorette party? Maybe you can just make it a few hours just to spend with the girls. Even if it's having them help you get some wedding stuff done? I am sure they would understand. I'm all for the Suzy Sleepover bachelorette party Be 12 again for a night!