WE ARE DOING THE SAME THING!!
We are definetly '' The more the merrier'' type. It may be our wedding, but it is also a vacation.
Besides, if the people you don't know are not comfortable crashing your wedding activities, then to me, that is ok too. I see it as a group together, with our wedding on one of the days. Some of our friend's parents are coming too, some we know, some we don't, and we don't care one bit either!