Some event ideas:

• Public LUG meetings
• Seminars
• Presentations
• Workshops
• Demonstrations
• Installfests
• Hardware recycling
• Art installations powered by Open Source
• Hackfests
• Translate-a-thons (Toronto is a great city for this!)
• Code sprints
• Developer's conferences
• Open source mass software giveaways (cd/dvds, flash drives)
• Coffee house
• Pub event
• Open source cruise in the harbour
• OpenStreetMap mapping party
• ...

Event venue ideas:

• Museum lecture theatres or rooms (Ontario Science Centre, ROM)
• Colleges, Universities (Seneca, Ryerson, U of T, ...)
• Libraries
• Open source company offices
• Public squares (Yonge-Dundas, Mel Lastman, Nathan Phillips, ...)
• ...