Catholics are married in the presence of a priest. They may or may not have a nuptial Mass. The bride's father walks the bride down the aisle and “gives” her to the groom, who walks out a few steps to meet her. The father then assumes his seat in the front pew on the left.
If a nuptial Mass takes place, the bride and groom and the wedding party receive Communion, and the guests frequently do as well. Of course, guests who are not of the faith will remain in their pews during Communion. That little bench at your feet is a kneeler, used during prayer; it's not a footrest.
Family members or close friends often give scriptural readings.