Ottawa Area Chamber of Commerce is sponsoring their 55th Annual Welcomeburger in Washington Square Park! This is the kick-off for the Riverfest! Everyone is welcome! Enjoy food, drink, and LIVE music! The fee includes a picnic buffet, with drinks and admission. Tickets can be purchased in advance at the Ottawa Chamber of Commerce, Ottawa Visitors Center, Reddick Library, or any local bank. View the website for more information.