Clear your calendar now! Saturday, May 11 is the day to experience 15 special Richmond Hill buildings. Expect expert guided tours as well as a range of unique activities. Take a solar-powered pontoon ride at Lake St.George Field Centre. Call ahead to book your seat at the Richmond Hill Heritage Centre’s all-day Mother’s Day tea. Go lawn bowling at the Richmond Hill Lawn Bowling Club. Test your star-gazing skills at the David Dunlap Observatory. Find out how to identify an artifact or mend pottery at the Swan Lake Centre for Conservation and Innovation.  Every location is just a short drive from the Avenue Towns. Doors Open happens once a year. Don’t miss it!