I DJed a 55th High School reunion for a class that had a state champion basketball team their senior year (school's only one over the years). Local newspaper was there to cover (most made it to the reunion), and current school principal spoke. She gave me a lifetime pass to attend any sporting event at the school.
I have a couple of boxes full of koozies from all the weddings I've done. I'm determined one day to figure out a way to display them. There are hundreds. 16 years ago when I got married, we handed out custom made CD's to all the guests that I burnt myself and put into plastic jewel cases. They were all songs that meant something to my wife and i.
I've kept a few cool ones over the years. The last one I did a couple of weeks ago had matches I haven't seen that in years. I got small bottles of a local whiskey, Maple Syrup, and a shotgun shell over the years...I'm shure the shell was a long story LOL
I got custom made Chinese Chop Stix in a very, very nice box one time.
I have brought home home made jams and jellies. One time I was given a bunch of bottles of beer that were left over, LOL. They were still cold. I put them on the floor in the back seat, and drank them over the next couple of days. Not much in terms of souvenirs.
Honestly, I can't even remember what my wife and I did for favors for our own wedding. I wonder if we did anything at all.
I got a souvenir once from a gig. A visit to the doctor and a few doses of antibiotics cleared it up though. lol
Actually, I have received a few things over the years. I have several wine openers and wine glass charms from past weddings. I have been offered centerpieces that no one took and I am pretty sure I did accept a few of them. There has been more but nothing that stands out or that I have kept. Usually it is something with the B&G's initials like small bags of custom monogrammed M&Ms and things of that ilk.