MortalPlague
Adventurer
As a less-than-serious adventure, I once ran the "Wild Goose Chase"... an annual goose hunt in the local woods, with a purse of gold going to the hunting group who brings in the most geese. There is, of course, a grand feast following the hunt, and a celebration. This sort of fare would easily work as a climactic 'festival' for the 0th level game, bringing things to a natural close where you can gloss over a few years to get to 1st level.
The other benefit of the festival is that it would draw all sorts of strangers to town, giving your PCs an excuse to have picked up skills and abilities they may not otherwise have access too. You can also create enduring NPCs who would have a good reason not to be in town when it was razed.
The other benefit of the festival is that it would draw all sorts of strangers to town, giving your PCs an excuse to have picked up skills and abilities they may not otherwise have access too. You can also create enduring NPCs who would have a good reason not to be in town when it was razed.