June 24 & 25 – Friends of the Farm Used Book Sale from 10am to 4pm, Free. Literally the best used book sale in Ottawa, choose from thousands of titles. It’s a two-day book sale for a reason! Bldg 72, CEF Arboretum, east exit off Prince of Wales roundabout. 613-230-3276 friendsofthefarm.ca/fcef-annual-events/