Another alternative would be a shuttle service. Many bus companies and even limousine services have large passenger vehicles that you can rent for the course of your event. They can be asked to go to one central pick up spot, if all of your guests are booked at the same hotel, or you can ask them to make multiple stops.
Some of these companies will only do one trip to your event, then one trip out, even if they do multiple stops. This will require you to advise your guests they need to be ready to board the shuttle at specific times. It does save your family and friends from having to worry about coordinating carpools.
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