Answer:
The main "event" of Hanukkah is the evening candle lighting. (Every night of the 8 nights of Hanukkah the menorah is lit with one more candle; thus on the first evening 1 candle is lit, on the 8th evening 8 candles are lit.)
Candle lighting is done preferably at dusk or as the starts come out. Latecomers can light as long as they have an audience - until dawn.
After candle lighting it is customary to sing songs (like Ma'oz Tzur) and play with a dreidel; a 4 sided Hanukkah-top.