Rehearsal Dinner - who to invite?

We have quite a lot of people that are going to be at our rehearsal dinner. We are inviting significant others and a bunch of family so we decided to do something less formal so it is not super expensive. More like a drop in and have some pizza after the actual ceremony rehearsal thing! I would maybe just invite the core few that need to be at the rehearsal to the rehearsal, and invite anyone else out somewhere afterwords.

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Since all of us will be from out of town, we're having a welcome dinner/cultural celebration the night before the wedding instead of a welcome dinner, and all of our guests are invited.

Maybe after your rehearsal dinner you could have a low "happy hour" or "meet and greet" at a local bar for those who aren't invited to the welcome dinner, as a sort of wedding kick off, but I don't think you're obligated.

We are inviting wedding party and significant others, parents and other siblings who aren't in the wedding party, our MC, my godmother.

So that is me, my FH, 4 bridesmaids (including his sister), 2 groomsmen (including my brother), 1 best woman, 4 significant others for wedding party, flower girl, ring bearer, my parents, his dad and his girlfriend, his half-brother, MC and his wife and their son, Godmother and her husband, also our officiant.

Which gives me... 26. We thought about inviting 2 out of town couples but since 75% of our guests are out of town, I didn't seem fair to pick 2. We are doing a morning-after brunch that we will open up to aunt/uncles.

For our rehearsal we are sticking to immediate family. Our siblings are in the wedding party, so that makes it a little easier.

So it will basically be my parents, brother & gf, Sister &BIL

FH, his parents, Sister &BF, Sister & BIL, Brother & SIL

Grandparents may be invited, but we are doing it at one of our houses, so we wanted to keep is smaller and inexpensive as we have to pay our officiant for the reherseal

For mine, I will also be having it the night before, at my venue, which is 45 min from the city!

However my numbers work out a bit different - so I will be inviting the significant others. We have Me and my Fiancé Kael, his 5 GM, my 5 BM, my 2 parents, his 3 parents, my 1 grandparent, probably only his 1 grandparent, his uncle (officiant), and then our wedding party has a couple couples - so I'm thinking add 3 more. Total of 23 people. We don't have a restaurant there though, so we are doing a BYOB and BYOM (bring your own booze and meat).

I wouldn't invite the out of town people for the rehearsal - they came for the real thing without an invitation for that. I would however entertain the idea of a welcome supper if you don't see them on a regular basis. For me - most people will be making their way to the city (from 4.5 hours north) on the Saturday so there wouldn't be any welcome supper needed.