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100 Things to Do in Boulder Before You Die Book Signing: Colorado-based travel writer Sandra Bornstein will talk about and sign her book 100 Things to Do in Boulder Before You Die — that explores everything from trail hikes to hot air balloon rides and learning to paddleboard at the Boulder Reservoir to atmospheric research tours; 6:30 p.m. Thursday, Boulder Bookstore, 1107 Pearl Street, Boulder; $5; boulderbookstore.net.