What Would You Do? - Shower "Drama"

GingerWife

OK maybe "drama" is an overstatement, but someone is going to be left unhappy.

My SIL (brother's wife) is throwing me my shower.  She is running/training for a half-marathon in mid-November so it cuts down on the dates that work for her. Since she is nice enough to throw the shower the last thing I want is for it to be inconvient or a burden for her.  We narrowed it down to 2 dates between the marathon and Thanksgiving.  My mom can't come one of the dates.  My MIL will have to reschedule her knee surgery if I pick the other date.

I obviously really want my mom there.  She and I are really, really close, but if I pick the date that she can't come, she won't fuss.  That's not her.

My MIL and I don't have the best relationship and I don't want her to feel like I am picking the other date to either counts her out or makes her life more difficult.

 So what would you do if you were me? 
-Pick the date that my mom can't come (super bummer)  or
-Pick the date that my MIL may not be able to come (and possibly make things more tense)

 Thanks girls!