Who goes to rehearsal/grooms dinner?

Those are 2 different things.
For the rehersal dinner you invite your parents, siblings, wedding party and their significant other, usually grandparents or anyone who is in the wedding or being walked down

View Quoted Comment What’s the difference between the dinner then? Is it necessary to do both...?

I haven’t heard of grooms dinner before, so I can’t say much on that.

But for rehearsal dinner, you should, at minimum, invite the wedding party, officiant, and parents/grandparents. I also hear it’s polite to also invite spouses/partners of the wedding party and anyone else who might be doing something (ushers, guest book, etc.)

For us, we’re inviting wedding party, their partners, the officiant, our parents, siblings, and grandparents.

I’ve heard that traditionally the grooms side of the family pays for the rehearsal dinner, but honestly, anyone can pay. Depends on how traditional you want to be. My fiancé’s grandparents are paying for ours but we put in the downpayment.

View Quoted Comment If i understand it correctly its called a grooks dinner if the grooms family is hosting and paying for the dinner for everyone the night before the wedding. I dont think people use the title"grooms dinner" much anymore

So I had to look this up because I had honestly never heard of a grooms dinner. Here goes: the rehearsal dinner and the groom's dinner are escentially the same thing. The distinction is in who is paying it. Since goom's family often pays for the rehearsal dinner is, it is sometimes called the "grooms dinner" as the groom's family is hosting a celebration of the upcoming wedding. If the rehearsal isn't being paid for by the groom's family then there's no reason to call it the groom's dinner.

Here's the article I found: https://www.annsbridalbargains.com/blog/2015/10/what-is-a-rehearsal-dinner-vs-a-grooms-dinner-7667.html

To summarize, no there is no need for both because they are different names/ways-of-doing the same event.

It really depends. I've been to some that included out of town guests, and some that didn't. We are including wedding party + significant others, parents, siblings, aunts, uncles & cousins. The person hosting pays for all meals (traditionally the groom's side but whoever can host).

I'm not sure what a groom's party or ending party are, but the rehearsal dinner is what you have after you rehearse your ceremony with your bridal party. Typically you invite: grandparents, siblings, parents, out of town guests, and bridal party (with their SO's & children)...or some variation. Unless someone kindly offers to pay, then the B&G is expected to pay for the food & drinks.