Kirby Puckett Weekend Signed

https://preview.redd.it/nfts4j9za6tg1.jpg?width=3072&format=pjpg&auto=webp&s=28999a8c420887b5a16273c6c1c368a4476b016d

I just found this subreddit and searched for this memorabilia and found nothing, which surprised me a lot (maybe my search criteria was terrible). I've been sitting on this card since the day I got it during a Twins game. Given it's an over-sized card I have no idea what to do with it.

I don't have the original ticket stub any more but what's a good way to get this authenticated/protected?