Like musicians and stilt walkers, vendors are a fixture at Rio's street parties. Known in Portuguese as “ambulantes” or “camelos," they scour Instagram pages for times and l

Sweat streamed down Talita Ferreira Sanches’ face as she pushed a cart loaded with beer and water up the winding, cobblestone streets in Rio de Janeiro last month, calling out to glitter-covered revelers decked out in fishnet tights.