Hi Donna
I googled 'seedy sunday montreal' and came up with this information from two separate links.

1. From www.seeds.ca
Montreal Seedy Sunday
Sunday February 8, 2009 10-4
Contact: Action Communitaire 514-484-0223

2. From this link:
http://www.hour.ca/news/news.aspx?iIDArticle=5348

... " Admission is free. Seedy Sunday takes place from 10 a.m. to 4 p.m. in the lobby near the greenhouse entrance at the Montreal Botanical Gardens, 4101 Sherbrooke E. (Pie IX). Parking costs $8 - bring $2 coins for the machines.

This last link has an article on the event you might like to read.

I hope this is not too late and is of help to you.

Bruce

OOOOoooops!!!!
I went back to the link[ www.hour.ca] above to share the info with a friend in Montreal and noticed that the date on the article is February 10, 2005.
((((((( 2005 ))))))))
Sorry I didn't notice this yesterday.
Guess you'd be best to call the number for Action Communitaire above.
Let us know if you go, what you find etc.

I am interested to meet with gardeners in Montreal once per year to trade seeds and plants. If you are interested, we can set up a mailing list to see if it is possible to organize a meeting in 2012.

I posted this message with another post before. If you already read this, please forgive the repetition.