This article examines how community-based groups have dealt with the potential housing impacts of urban mega-events (also known as 'hallmark events') in the city. Three Canadian case studies are used- Expo '86 in Vancouver, the 1988 Calgary Winter Olympics, and the rejected proposal for the 1996 Summer Olympic Games in Toronto- to discuss a range of issues including the nature and impact of community action in forcing the organisers of mega-events to address the potential of event-related housing impacts. The research findings suggest that mega-eventrelated forced evictions should be viewed as an expected result of this form of urban restructuring as these events are used to bring new people, new facilities, and new money to cities ata rapid pace,and this goalis rarely evaluated in an open democratic manner. Further, the critical prerequisite for any effective community action to occur is the presence of an organised, strategic and resourceful coalition of community-based groups which have the capacity to analyse complex situations, act forcefully at a variety of levels, and use diverse strategies in order to take advantage of key 'openings' when seeking to achieve their goals.