Autumn across Crete means tsikoudia (Cretan raki) distilled from grape pomace in copper stills. The communal distillation gatherings — rakokazana — are social feasts in their own right, with food, music and dancing around the still while the fresh spirit drips.
Tsikoudia is the Cretan spirit — clear, strong, an EU protected product, and offered freely at the end of almost every meal on the island. From mid-October the villages of the Heraklion region fire up the kazani (copper stills) to distil the year's pomace, and the distillation becomes an event: neighbours gather, meat goes on the grill, the lyra comes out, and the first raki is tasted hot off the still.
This is a tradition rather than a single ticketed festival, so the way in is through the villages — if you are in the Cretan countryside in late autumn and see smoke and hear music, that is very likely a rakokazano, and visitors are typically welcomed warmly. Some villages run organised raki festivals; the best-known dedicated one is actually in the Chania region to the west, so treat the Heraklion experience as informal village hospitality rather than a fixed event.
Honest note: dates here are an indicative season window, not a single scheduled day.