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Programs at the two-day expo will demonstrate the techniques prehistoric Native Americans used to thrive in the harsh environment of the desert Southwest. Between demonstrations, visitors can enjoy Native American entertainers, tour prehistoric and historic sites, watch living-history re-enactors, play games, take part in interactive activities and sample ethnic foods. Visitors receive free raffle tickets for archaeology-related prizes. The free expo is from 9 a.m. to 4 p.m. Saturday and Sunday at 1013 E. University Blvd., Tucson. Click here for more information, or call 520-621-6302. For a list of more Archaeology and Heritage Awareness Month events, click here.