Reception Invite-- No Dinner Served-- Wording?

We are having a small destination wedding with family a week before our HUGE reception... I would like to know the proper wording for a reception-only invitation that lets our guests know that dinner will NOT be served. (We`re serving cake, coffee, and SOME snacks and appetizers.) How do I tactfully word the invitation to ensure our guests don`t come to this party expecting more food?