Awesome, glad I'm not alone in this! I've actually only had one person not recognise me and then later have it click, but it was over the phone that he didn't catch it, saying he had met me yet. About an hour later it clicked (he's in management, and was somewhat in the loop when I am out) and he called my mom going "Oh! I figured it out now!" all excited, like he'd just solved the case of the new accountant. 😉 Also, great solutions, guys! I'll definitely keep those in mind in the future.
Luckily I won't have the reunion problem, as I came out during my last school year pretty loud n' proud, but I could definitely see that being a small issue when trying to reconnect with old classmates. Good luck, to those of you in that situation!