Easy-to-follow cooking demonstrations by Tucson Originals restaurants take place at the following times: 2 p.m., Friday, July 23: Bluefin Seafood Bistro and Kingfisher present "The Milk Family for Muscles." All events are free with museum admission of $6 for ages 2 to 18 and seniors; $8 for adults; and free for those younger than 2. Registration is required. Call 792-9985, ext. 114, to register. Visit www.tucsonchildrensmuseum.org for more information.