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.

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.

Known in Portuguese as “ambulantes” or “camelos," street vendors scour Instagram pages for times and locations, coordinate on WhatsApp groups, then race across parks and up hills, from Rio’s downtown to Copacabana beach,