Best Period to Go: In July the Dragon Boat Festival, in September the Moon Festival and Chinese New year events are celebrated in Denver. So tourists mostly visit the place during this period to celebrate the annual festivals of Denver. Denver hosts two largest Hispanic celebrations in the nation. One is Cinco de Mayo occurring in the month of May and the second one is EI Grito de la independencia occurring in the month of September. All in all the months of May and September are the favorite months for the tourists to visit and celebrate the festivals in the city of Denver.