Plus Ones at Rehearsal Dinner?

We are, yes. Usually your rehearsal dinner is fairly small and for close family/people in the wedding, unless you have an out of state wedding and then I've seen some couples host everyone, so most of the time people expect that their plus ones are invited.

I think it's typical to give a plus one for the rehearsal dinner.

If you’re referring to significant others, yes we allowed them, but these are not plus ones. If you’re referring to true plus ones for single guests, no, we did not invite any to the rehearsal dinner.

Significant others--yes, this was a non-negotiable. Random dates, nope!

We are. All of our wedding party's significant others will be invited and then the couple that are single can bring along a guest if they'd like.

This really depends on the formality of the RD. If you have a rehearsal at 11am Sat two weeks before, or one evening after work, common for local weddings, if it is informal like going home to a cookout or cross the street for pizza, it may be only the participants in the ceremony who were able to mae it to practice. No family except Dad or a sister or brother in the wedding party, and no Spouses or SO. If you have a more formal sit down dinner, at a usual meal time ( sometimes up to 2 weeks before the wedding itself, and not necessarily following the rehearsal, then an invitation should be given to each DO or spouse, and parents of any children you include in the bp. Parents often given RD, but if not they may be invited to attend, or not. If groom's parents or other relatives host a RD, they have a good deal of say on opening it up to relatives from out of town, or siblings of B and G and their SO. Some depends on the bride and groom choices. RD is a time when some thank their wedding party. But other longstanding traditional way to do it are for the B and G to jave a separate meal just for wedding party. Like a meeting of coworkers or a bridge club, it can be just for those involved, with no obligation to invite couples. But may include spouses and SO. And the other main thank you choice may be just bride and her ladies have a meal out, and groom and his guys. With all these choices, the way the couple wants to use the RD varies a lot. And who is invited varies.

Significant others yes. Dates for singles no. Out of area guests not involved in the ceremony as attendants are not invited either.