In the UK it is this Sunday I think, its called Harvest Festival. It happens on the next Sunday after the Harvest Moon appears on the Autumn Equinox. Christians here take a basket of food to a church and prayer of thanks are said. The food is then distributed to the needy, it is not classed as a public holiday and there is no specific meal.
When I was a kid we would on occasion visit relatives in London, I loved it when the festival of Sukkot was taking place. We would stay with my Uncle Maury he would build a Sukkah in the garden.