The Truckee Donner Chamber of Commerce will host its 21st annual Business Expo & Chamber Mixer 5-7:30 p.m. April 24 at The Resort at Squaw Creek. The Business Expo, designed to be part expo and part business social event, will showcase more than 80 different businesses to demonstrate the strength and variety of the local economy and foster a positive business environment. According to a press release by the chamber, tradeshows are one of the most proven ways to reach customers, and sales are frequently developed through the relationships created with other people. A new addition this year is that …