Welcome Dinner

For those of you that had a welcome dinner the night before - who did you invite? Only out of town guests? Only out of town family? What about the family that is in town? Your entire guest list?

Our issue is - FH's step-sister got married last year and had A BUNCH of out of town guests (mostly family), they had a rehearsal dinner with just the bridal party (which is fine) - however this meant a lot of the family was mad that they didn't get to spend time with them outside of the wedding - which really IMO who cares, its their wedding. However, now FH and I are getting married in December we want to have a welcome dinner for our out of town guests as FMIL has like 10 sisters (all of whom are traveling for the wedding), and we want to be able to spend some time with them the night before. I just can't figure out where to make the guest list cut off... advice? Or if it is even considered a welcome dinner at that point?