Simply "to solemnize".

What?!

If you were married in a civil ceremony and now would like to have a religious ceremony, your invitation would state that the ceremony was being performed to solemnize your marriage (to solemnize=make right before God).

Mrs. Andrew Jay Forrester

requests the honour of your presence

at the religious ceremony to solemnize

the marriage of her daughter

Jennifer Marie

and

Mr. Nicholas Jude Strickland

etc.

{Crane and Co., The Wedding Blue Book}