In this day and age, there isn't really a 'correct' wording for anything. Something like 'we invite you to celebrate our marriage at [venue]' works well to make it clear that they are not invited to the actual wedding.
There are many details you can add, the basics are as such:
Reception immediately following ceremony
in the reception hall of the church
Mr. and Mrs. Gunner Johnson
2003 Alpine Street
Boston, Massachusetts
