Denver’s annual Free Night at the Museums is both a gift and a challenge for cultural bargain hunters. There are 17 museums on the list this year, all inviting visitors to enter at no cost. But the event only goes from 5 to 10 p.m., which means you’ve got to be agile to make the most of the opportunity. Related: Mixing the past and present (and art and artifacts) to tell the story of Colorado Of course, there are other cultural events to take advantage of during Denver’s Arts Week, which is actually a 10-day extravaganza kicking off Nov.