A big temple fair at a temple on shore of Cibi Lake.
The festival spreads over two days. The daylight hours of the first day are dedicated to preparations inside the temple, but in the evening, from around 8pm, lanterns are floated on the lake. The second day is the main temple fair, starting around 10am and lasting until the afternoon.
Update: it looks like that floating the lanterns has been discontinued, the first day is mostly preparations while the second day attracts the main crowd.