I'm gonna pop into dragon con for two days this year... Sat/Sun. I went several years ago and fun the experience to be a nice change of pace from the way cons like Creation Ent runs.
Thus far... it looks like the list of Trek Alum will be
Jonathan Del Arco
Garret Wang has been organizing the Trek Track for the last few years, and I got Sir Patricks Autgraph the last time I went and found him to be delightful and charming!
I'm assuming the headliners are intended to be Jeri, Patrick, Walter and Karl, which is a pretty good lineup for a minor convention. I may actually try and meet Karl, as I really have enjoyed him in all kinds of movies as well as Almost Human!