I still have Mark to do, and I figure one year I will do him before it's too late.
I stuck to lower tier guests ... but enjoyed my time with my bro Gibbby in line for Davis.
See I did the opposite. You never know how long someone will be around. This was a chance to meet Luke Skywalker so I took it. If I attend another Celebration I'm going to meet a ton of 3rd and 4th tier characters though!