Getting married at the courthouse but having the ceremony/reception next year

We are just going to the courthouse to get married in the next couple of weeks, but we want to have the ceremony and reception next year when more money is available. How would I go about the wording on the wedding invitations if we're already married? My last name will already be his at that point.

Edit: I may not have a lot of responses, but the consensus is clear. I will word it as a vow renewal/reception. My fiancé and I are Christian, so the vow renewal is a religious ceremony. Thank you to everyone on your advice and I will continue to read the comments. You guys rock!