RORY: What are you doing here anyhow? This is a town meeting for people who participate in and care about the town.
JESS: Well, Corky’s Country Cavalcade on public access was pre-empted, so I thought I’d check out the next best thing.
Corky’s Country Cavalcade, a fictional rural television program Jess has sarcastically invented to suggest that the town meeting is the closest real world parallel. Coming to a town meeting might mean that Jess does feel more connected to Stars Hollow since Rory has nagged him into helping out at the diner more at a time of family crisis, or that he wants to lend Luke some support. Or he might just want another chance to see Rory … his expression says he does. (Remember when Dean turned up to a town meeting just to see Rory?).
In North America, pre-empted is used in broadcasting to mean that a regular scheduled program has been interrupted or replaced.