First there's about a million sp's that will take care of this request.........Duttslist and Backpage have lots of selection.
Secondly, make sure the groom actually wants this to happen...... don't assume, because you could be placing him in an impossible situation that creates circumstances his relationship can't recover from. I know at my stag I had my future BIL and for a while my FIL as well as a bunch of mutual friends......as much as I would have enjoyed it, that shit would not have gone over well with her family etc.
Now if he's cool with it.......knock yourself out but seriously.........check first. IMHO.