The members of the chambers of commerce in Albert Lea and the Iowa cities of Mason City and Northwood will participate in the 2011 Regional Business Expo from 4 to 7 p.m. March 24 at Diamond Jo Casino. This expo is open to the public, and last year’s attendance reached over 300 during a three hour time frame. In order to exhibit, businesses must be a member with one of the participating chambers. There are 44 booths available.