Of course Valentine's Day is the most popular variation on this theme. People also have Christmas and Halloween weddings. Sometimes this party continues in an additional hall after the normal-length reception. Sometimes it moves to someone's home. Usually it winds up with a breakfast the next morning.
Weekend wedding Takes place at a resort or hotel.
You spend the whole weekend with your guests on a mini-vacation. It's a surprise for the guests. Invite them to a regular party, and when they arrive, they find out it's actually a wedding. If you have a backyard big enough, or an interior big enough. It can be as formal or informal as you want.