Say hello to CounterConvention.Org--a clearinghouse for protest activities during the Republican Convention. From their "about page:"

In what could be one of the largest U.S. political demonstrations in years, hundreds of thousands of people from all over the country are expected to converge on midtown Manhattan in protest of the Republican National Convention this summer. ...For the past several months dozens of groups have been meeting to discuss strategy and logistics for protesting the Republican agenda. Instead of planning a traditional demonstration, CounterConvention.org has built a sophisticated website designed to coordinate the organizing efforts of others.

The website includes a directory of local and national groups organizing around the convention, a calendar of upcoming events, legal information, posters and materials, and housing and transportation resources. [It] is designed to help connect organizers and activists with people interested in being involved, especially those that may have never attended a political event or demonstration.