yeah according to my boyfriend, stores here in Quebec close pretty early (since I've been here all my life, it's not annoying me that much...) and knitting stores are probably the worst since they generally don't have many employees
I know however that Effiloche has a "stitch n'bitch" every friday nights from 6:30pm to 9:30ish and they are also open on thursday nights until 9pm. They are accessible by subway (Beaubien station), and it's close to little Italy.
Mouline is closer to downtown (Lionel Groulx station) but they close at 6 or 7pm. "A la tricoteuse" doesn't seem to have a website, but it's easily accessible by subway as well, (Mont-Royal station). I don't know their hours, you can call before but that lady is SOOO unbelievably unfriendly it's ridiculous... and I don't know if she speaks english (and if she would be any nicer).
Overall, in the province, stores close early on monday, tuesday and wednesday (generally around 5-6pm) but are open later on thursday and friday (9pm). On saturday and sunday, they also close around 5pm in general. There are exceptions though: most grocery stores will close at 11pm any day of the week, drugstores at 9pm, some SAQs (to buy alcohol) will close late as well.
Anyways if you have any other questions, just ask and I'll do my best to answer! I hope you will like Montreal...
Oh and btw, it's winter... so it's cold! Knit yourself a scarf!