27th September is Mid-Autumn Festival – zhōnɡqiūjié, 中秋节. I have a week off school, from 1-7 October and start teaching on Thursday 8th October (which is good as I only have one lesson on a Thursday).
At Mid-Autumn Festival, mooncakes are eaten. My book Easy Peasy Chinese: Mandarin Chinese for beginners describes the festival as happens during the full moon closest to the Autumn equinox, and that it is when the moon is at its fullest and brightest. It is apparently the best time to celebrate the abundance of the summer’s harvest. Everyone eats mooncakes and family and friends get together to celebrate and admire the harvest moon.