Recently we've had a few couples ask about pre-ceremony drinks. Personally, I think it's a great idea and something extra for your guests to enjoy. For my own wedding we made sure our guests were greeted with champagne while they waited for the ceremony to begin. We knew we had a fun crowd coming and didn't see a reason for everyone to wait until after the ceremony to enjoy a drink.
With warm weather quickly approaching pre-ceremony drinks don't have to include just "adult" drinks. Set up a lemonade bar or a water station for your guests to cool off as they mingle.