What gathers 100,000 people to the streets of downtown Tucson to celebrate loss, life, and the meaning of it all? The All Souls Day Procession, a special night to celebrate those you have lost, is a long lasting tradition in Tucson. As masses of people begin to celebrate and walk down the streets of Tucson, you will see many different cultures and ages come together. It’s easily one of the most celebrated holidays in Tucson with this year’s celebration, Nov. 2-4, being the 29th annual event.