LadyL, I recall an earlier thread you'd started about your MIL inviting some relatives to the wedding without asking you and DF first, and it was an issue because you hadn't intended to invite them. Is it possible she's still angling to get them in? Could she be hoping that forcing the subject of the wedding to come up will cause some of these relatives to say to you "We were disappointed to hear you were keeping it small, we would have loved to have been there!" thereby creating an awkward moment where you might stammer "Oh, um, well, actually we'd love for you to come..."?
Poddity - poddity - pod and pod!
From your previous posts, LadyL, it is apparent that FMIL is extremely manipulative, and does not respect boundaries. I suspect that she has hatched some plot in her head to get her way with your wedding.
It's unfortunate that your husband is so adamant about going to the reunion this year. I suspect that FMIL will make you both uncomfortable many times by talking about the wedding in front of people that you are not planning to invite.
I wouldn't be surprised if she manages some sort of a surprise shower, either. If you were faced with a roomful of smiling guests with gifts you and DF would just have to make the best of it, and FMIL knows this.