11
July
RHDDO Tom Talks Astronomy - July 2026: "Amazing Time Travel in Movies and Science!"
Join us for a family-friendly, multimedia talk hosted by TEDx speaker Tom Vassos!
29
August
AICO Astro Fair 2026
Join us for a fair of astronomical proportions at York University with the Allan I Carswell Observatory and our event partners.
20
August
RHDDO Summertime Telescope Night - August 20, 2026
Come view the summer sky through Canada's largest optical telescope!
13
August
RHDDO Summertime Telescope Night - August 13, 2026
Come view the summer sky through Canada's largest optical telescope!
16
July
RHDDO Summertime Telescope Night - July 16, 2026 (NO-GO for tonight)
Come view the summer sky through Canada's largest optical telescope!
2
July
RHDDO Summertime Telescope Night - July 2, 2026 (NO-GO)
Come view the summer sky through Canada's largest optical telescope!
19
June
Millennium Square Public Star Party - June 19 or 20, 2026 (GO for Friday)
Join us for an evening of free public stargazing along the north shore of Lake Ontario at Millennium Square.
15
May
RASCTO Telescope Workshop - May 2026
Are you a RASCTO Member with a telescope, but don’t know how to use it? The experts from RASC at the Richmond Hill David Dunlap Observatory can help!
19
September
City Star Party: Long Branch Park - Explore the Moon - September 2026
Join us at the lake This is your chance to learn about moon features, hone observing skills and maybe even earn a RASC Explore the Moon - Binocular or RASC Explore the Moon - Telescope certificate!
22
August
City Star Party: Long Branch Park - Explore the Moon - August 2026
Join us at the lake This is your chance to learn about moon features, hone observing skills and maybe even earn a RASC Explore the Moon - Binocular or RASC Explore the Moon - Telescope certificate!