Hi Dave,
I guess you know how to unlock sites one at a time. However, there isn't a way that I know of to unlock multiple sites at once. Perhaps you should post this in the Mod Requests forum.
p.s. - It's still a few hours before Christmas officially begins here in the Pacific Northwest. In a little while, we are going over to my sister-in-law's house for the annual Christmas pig-out.
I hope everyone is having a good holiday season!