The weather has no effect on how much fun little ones have at the annual Trick or Treat Street event at the Children's Museum of Denver. If it's mild, there are lots of free activities outside on the museum plaza including a mini train ride, crafts, games and spooky photo setups to capture those cute little ghosts and goblins in costume. If it's snowing and cold, head inside (admission fee) for safe trick or treating, visits with storybook creatures and creepy crafts.