Reclaim the Night events often involve a broad coalition of women’s groups uniting around the issue of violence against women. The London Feminist Network has been coordinating the national marches (in London) for the past few years, and there are lots of local marches which are organised by city or region. The website for Reclaim the Night aims to provide coordination between and support for local initiatives, as well as driving the national march.
Some groups/website which you might find useful in finding out about Reclaim the Night, or in organising your own (go for it!), are: