From the webpage:
Doors Open has been a staple event in our Region since 2003. On the third Saturday in September, Waterloo Region opens its doors to curious residents and visitors alike – attendees can tour noteworthy buildings, interesting places and heritage sites in Waterloo Region, many of which are not regularly open to the public.
Doors Open Waterloo Region creates meaningful qualitative experiences, delivered through storytelling, in celebration of our diverse community culture, heritage and architecture.
Doors Open Waterloo Region returns as an in-person event in 2023 on Saturday, September 16 from 10:00 a.m. to 4:00 p.m. A day of discovery: tour 20 local destinations including noteworthy buildings, interesting places & heritage sites. Admission to all Doors Open sites is always free.
Join our mailing list to receive updates and notifications about this year’s event. Mailing list members are eligible to win great, exclusive prizes throughout August and September.
For complete details about this year’s 20 participating sites, visit Doors Open Ontario.
https://www.doorsopenontario.on.ca/pages/events/waterloo-region
Unfortunately that is probably true.