Now that Earth plans to cut its energy bill by having daylight only on Wednesdays, humanity will need to adapt to endless night if it's to keep owls from stealing all the jobs and delicious mice. Start building up your glow-in-the-dark vision with today's Groupon: for $5, you get one general-admission ticket to the Garden After Dark Halloween festival at Red Butte Garden (a $10 value) on Thursday October 20 or 27. Garden After Dark takes place October 20–22 and 27–29 from 6:00 to 9:00 p.m.

Red Butte Garden, a botanical jungle dedicated to conservation, gets dressed up for Halloween during Garden After Dark: Light Up the Night, an educational, kid-friendly festival of light displays, crafts, and storytellers. Explore a magical cave twinkling with hanging strands of luminescent glowworms while dodging stalactites and stalagmites, or wander down the secret pass through the enchanted forest, glowing with incandescent fireflies and dotted with spider webs and fungi. The luminance of stars and galaxies pours into corneas as guests comb intergalactic planes with telescopes at the Clark Planetarium to point out astrological constellations and name undiscovered planets after beloved station wagons. Face painters ornament mugs with tarantulas, a moon and stars, or black cats, or visitors themselves can try their hand at decorating a face, be it their own, a loved one's, or a pumpkin's. Warm hands over one of many fire barrels or by cupping hot drinks that complement the sweet treats of local vendors. Like onion rings in a box of french fries, costumes are always welcome.