cuba is trying to re-establish itself at the two-day summit in panama , arriving with more than 100 government officials , diplomats , small business people and artists .
cuba 's attempts to rebrand itself as an open , diverse society stumbled wednesday when government supporters and anti-castro supporters brawled in the streets of panama .
video of the incident showed cuban government officials exchanging punches and insults with dissidents until panamanian police in riot gear broke up the melee .