2. If you and your intended are hosting, rather than parents, I would simply go to a stationery store that does invitations and look through the sample books for ideas. (I would also have them do the printing...wouldn't be bothered doing that myself. )
The honor of your presence is requested
at the Nuptial Mass uniting
in the Sacrament of Holy Matrimony...
This is an easy possibity I received recently when there were too many divorced and deceased parents to list all.
Just to mention, a Catholic wedding no longer implies a Mass, as one response said. Plenty of Catholics are married in a liturgy that does not include the Eucharist.