where would 당신 go to find out about public appearances of 로스트 cast members??

Well right now the cast is pretty busy shooting the 6th season and the rest of the time they're probably busy with personal stuff 또는 other work.

You're best bet is to scope out some big media conventions (comic con's and the like) and see if a cast member is doing a public appearance 또는 a panel on a show 또는 movie they're doing.