Are you ready to purify yourself in Lake Minnetonka? Will you cry with me when Prince plays the titular song? This movie is a modern classic, and if you don’t show up to this, someone will come to your house and ride a motorcycle over everything you love. The movie is great on its own (daddy issues, nudity, and intensely catchy ’80s pop songs), but tonight there are free inflatable guitars and a Prince music video sing-along. What are you waiting for? Let’s hug, let’s dance, let’s live this moment together. (SIFF Cinema Uptown, 511 Queen Anne Ave N, siff.net, 9:30 pm, $13)