The New York Civil Liberties Union (affiliated with the national ACLU) has announced they will open a temporary storefront to provide information to media, police, protesters, and the general public about free speech rights and also monitor protest activity during the Republican National Convention in New York City,
The storefront is located two blocks from Madison Square Garden at 520 Eighth Avenue (between 36th and 37th Streets)
They have also launched a website which has a convenient listing of all officially permitted marches and protests, and a map of the street closures near Madison Square Garden: