Directly following the names of the hosts, you would request the attendance of guests with the words...
"the honour of your presence", as is demonstrated in above invites. Non-religious informal alternative, "the pleasure of your company"
A Roman Catholic wedding... Replace the words, "at the marriage of", with "at the marriage in Christ of..." Below the Groom's names you may add "and your participation in the offering of the Nuptial Mass"
A Jewish Wedding... Replace the words "request the honour of your presence", with "invite you to celebrate simcha of their marriage" or include "according to the laws of Moses of Israel" after the groom's name.