What are you looking at budget wise? and about how many people are you looking to invite? Im getting married at Tosca, and although they are slightly higher priced, they are excellent an helpful with everything I have needed. Im not sure if they have dates available in sept/Oct, but it doesnt hurt to call.
Congratulations to you both on your upcoming weddings! In response to the request for an affordable venue, Carruther's Creek in Ajax is a nice facility with an affordable price range. Carruther's Creek also has some beautiful surroundings (it's a golf club) and with the Fall colours, you would have some beautiful backgrounds for photos!
Some advice to both of you as well.... Make sure you choose a photo location that has lots to offer: In the Fall, tall trees are great.... I would also look for stones, steps, walkways, a balcony, brick walls, a lake, a creek/pond, and/or some unique places and finds including old run down buildings, train tracks, old doors, brightly coloured walls, fields, etc.
I just covered a wedding in Port Hope last weekend at the golf and country club and I loved the photo spots it offered!! I'm not sure where they sit price wise but if you don't mind the 30 min drive, it was very nice and even had a bathtub for photo use. (Photos from that location are posted on my website, and facebook page).
I wish you both all the very best at your plan your wedding day!!
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