Honoring Deceased Parents During Ceremony

So my parents passed away when I was 11. I always planned of honoring them by leaving 2 empty chairs during the ceremony and a memory table for all of our deceased loved ones at our reception.



Now that we're having our mini wedding before the bigger one, I still want to do something special during our ceremony. We can't do the empty chairs because it's very low key and people will probably be standing or sitting on a bench at the public park.I want the officiant to add something in the sermon about my parents, just not exactly sure what should be said. Our officiant didn't know my parents, but he's my manager and I'm very close with him.