Because i have chosen to have my wedding two at my church which is two hours away from where my parents and grandparents live my parents have suggested having a short reception at the church immediately after the wedding for everyone and then a second smaller party for "the younger crowd" where we could dance the night away. Is this something acceptable to do? If so should I invite everyone to the first reception or should people be invited to only one reception? Do FH and I get to do the going away/bouquet throwing at the first (because I assume that most of the really younger crowd will not come to the second party)
Everyone should be invited to the entire reception. It isn't polite to invite some to only part of it. Plus, it isn't polite to host a reception hours away from the wedding unless this is a destination wedding and the reception is held at home after the couple returns from the wedding.
So, it would be best to host one reception close to where the wedding is being hosted. If this isn't possible, then perhaps your wedding should be private and the reception held later.