Twinkle, twinkle. GAZE Canicular What: Demetrius Oliver transforms The Print Center into an observatory with video installations, a wooden chamber to crawl inside, and a live feed of Sirius from a telescope mounted on the roof of The Franklin Institute. Why: Get there fast — the exhibit is open only when the star rises in the sky each night. When: Thru Mar. 22. Tues.-Sat., 7-8 p.m. (weather permitting). Where: 1614 Latimer St. (215-735-6090). Admission is free. CLICK The Download What: Fitness apps, exercise videos, and healthy-living fodder that caught our eye. Why: Short and sweaty workouts, an app that socializes your class schedule, and our very own gym playlist. When: No time like the present. Where: At dailycandy.com. SWOON Bhldn Sample Sale What: Score wedding gowns marked as low as $100 at the collection’s first-ever sample sale. (Prepare to stand in your skivvies — there are no dressing rooms.) Why: You’ve had your eye on those Delphine Manivet and Catherine Deane dresses for months. When: Sat., 10 a.m.-1 p.m. Where: The Navy Yard, 5000 S. Broad St., bldg. 3. WATCH Other Desert Cities What: In the Pulitzer-nominated play, chaos ensues when a writer returns home to Palm Springs and threatens to spill her family’s secrets in her upcoming memoir. Why: Your clan has nothing on this one in the drama department. When: Thru Mar. 2. Schedule at walnutstreettheatre.org. Where: Walnut Street Theatre, 825 Walnut St. (215-574-3550). Tickets ($10-$85) at 800-982-2787 or walnutstreettheatre.org. DISCOVER Searching for Philadelphia Book Talk What: Local architect and author David S. Traub discusses his tome filled with black and white photos of oft-overlooked sites. Why: He captures the magic of hidden courtyards and architectural gems you’ve stumbled past dozens of times. When: Tonight, 6:30-7:30 p.m. Where: Center for Architecture, 1218 Arch St. (215-569-3186). Admission is free. SPRINT Fishtown Beer Runners What: Join dozens of runners on three- to five-mile jaunts that end in bars across town. Why: Who needs coconut water when you have whiskey and Coke? When: Every Thurs., 7 p.m. Where: Starts at 2346 E. Susquehanna Ave. Photo: Demetrius Oliver, Heliometric, 2014 / Courtesy of The Print Center, Philadelphia.