PLANNING AHEAD: There's a bit of a balancing act that goes down in Park City every January. You arrive knowing the films that havepiqued your cine-interests, and yet you also want to leave some room to find an untouted, soon-to-be-loved-everywhere gem (the photo above is so very Park City, in the touting of these potential gems). You can get on the first part, those advanced tickets, and the planning ahead, over at the Sundance site. The Festival sent a reminder that there's a week to go on the whole advanced ticket registration, but even if you don't feel ready to go that route, you should best read up on how to buy tickets and ticket packages. Opening date of the mega-fest is just over a month away, and there are things to know. So know them, film fan, know them now.