I was going to say photo corners, too. But I was ALSO going to say run to Kinko’s / Staples… and get them (or fragile ones) scanned. If there is a priceless picture that gets snagged or ripped the time/$$ costs will seem well worth it. They can also scan it to a thumb drive and you can mail that out, which people really appreciate.
We had scanned all Mom’s pictures and DH went out and got a digital projector just for her service. We had the slide show running while people came in and left it running while they came in for a lunch. It was fun to have people see themselves and I got a lot of requests for the pictures. We had a LONG time to prepare as she was in AL and memory care almost 5 year. You won’t have time for that, it is just FYI for future events.