Small town drama!

I agree. The only way you can keep unwanted guests out is hiring somebody to escort them out

I agree with the previous posters, hiring security would be your best bet to keep out unwanted guests. As for your parents, I would suggest to think about whether you want them to attend or not. It's possible that they will be upset that they aren't invited, but it's hard to tell. You said that you haven't talked to them in 21 years, so maybe they won't be upset if you explain that you just don't feel close to them. If you want them to attend, you could have them just attend as guests and not make a big deal out of them being your biological parents? For example, my mom is coming but I'm not having her wear a special dress, get ready with me, etc. because we aren't close. It really boils down to what makes you feel comfortable for your relationship with your bio parents

Hey there, Kirsten!

I'm sorry that this is something you have to worry about.

Would a day-of-ordinator be within your budget? He/she could run interference in instances with uninvited guests.