Rehearsal Dinner.. necessary or no?

FH and I are having a destination wedding in Florida on Saturday, May 12th. The only time we can do a rehearsal at our venue is the Thursday before the wedding, but 4 of our bridesmaids/groomsmen don’t fly in until Friday the 11th.

We have the venue all day Saturday 7a.m. to 11p.m. So my coordinator suggested we just do a quick run-through that morning, which I think would be fine since the guys will all be standing up next to FH anyway. Only the 4 girls will walk, and then me with my father and step father.

We are doing a “girls night out” and “guys night out” Friday the 11th for a couple hours and want to treat our guests to apps and drinks then. That being said, is it wrong of us not to do a rehearsal dinner? The only day that would really work is that Thursday before the wedding, but most of our BP won’t be able to attend. We can’t do it before we fly out, as half our family is in one State, and half is in another.