On Opeth Ticketing, they mention that more dates will be announced tomorrow. I'm crossing my fingers for Montreal!!
It's only a 10 hour drive from Montreal to Cleveland. Maybe they can make it happen ?
^I'm seeing both Sigur Ros and Opeth this year, but not within two days! That would be an awesome 48 hours.
You are lucky. Opeth will play in Seattle on the 4th of October. Check out all the dates on opeth.com.