Each lunar month, Taoists celebrate particular deites and Lao Tzu by having a festival. Tomb Sweeping Day is celebrated every 15th day after the Spring Equinox which is where people feed their ancestors cold food. The Dragon Boat Festival is celebrated on the 5th day of the 5th lunar month which is when the day is longest and people ride dragon boats because dragons symbolize feminine and masculine energy. The Ghost Festival is celebrated on the 15th day of 7th lunar month which is where descendants pay homage to their ancestors. The Mid Autumn Festival is celebrated on the 15th day of the 8th lunar month which is where harvest festivals are held. The Double 9th Festival is celebrated on the 9th day of the 9th lunar month which is where people climb a mountain while wearing the zhuhyu plant and drink chrysanthemum wine because the day is a dangerous date. It is a dangerous date because it is a date with an abundant amount of Yang.