Venezuela opposition leader Guaido appears at aid concert

Concert goers unfurl their Venezuelan flags during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela Friday, Feb. 22, 2019. Venezuela's power struggle is set to become a battle of the bands Friday when musicians demanding President Nicolas Maduro allow in humanitarian aid and those supporting his refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are stored. (AP Photo/Fernando Vergara)
Concert goers unfurl their Venezuelan flags during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela Friday, Feb. 22, 2019. Venezuela's power struggle is set to become a battle of the bands Friday when musicians demanding President Nicolas Maduro allow in humanitarian aid and those supporting his refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are stored. (AP Photo/Fernando Vergara)
Colombia's President Ivan Duque, speaks flanked by Chile's President Sebastian Pinera, left, and Venezuela's self-proclaimed interim president Juan Guaido, in front of the warehouse housing U.S. humanitarian aid destined for Venezuela, in Cucuta, Colombia, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Colombia's President Ivan Duque, speaks flanked by Chile's President Sebastian Pinera, left, and Venezuela's self-proclaimed interim president Juan Guaido, in front of the warehouse housing U.S. humanitarian aid destined for Venezuela, in Cucuta, Colombia, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Spanish singer Miguel Bose performs during the Venezuela Aid Live concert at the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. Venezuela's power struggle is set to become a battle of the bands Friday when musicians demanding President Nicolas Maduro allow in humanitarian aid and those supporting his refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are stored. (AP Photo/Fernando Vergara)
Spanish singer Miguel Bose performs during the Venezuela Aid Live concert at the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. Venezuela's power struggle is set to become a battle of the bands Friday when musicians demanding President Nicolas Maduro allow in humanitarian aid and those supporting his refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are stored. (AP Photo/Fernando Vergara)
Puerto Rican singer Luis Fonsi performs during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Puerto Rican singer Luis Fonsi performs during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Reymar Perdomo sings "I Left," during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. Her song has become the unofficial anthem of Venezuelans fleeing their country's economic and political crisis. (AP Photo/Fernando Vergara)
Reymar Perdomo sings "I Left," during the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. Her song has become the unofficial anthem of Venezuelans fleeing their country's economic and political crisis. (AP Photo/Fernando Vergara)
Concert goers enjoy the performances during the Venezuela Aid Live concert on the Colombian side of Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Concert goers enjoy the performances during the Venezuela Aid Live concert on the Colombian side of Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
This photo combo of file photos shows opposition leader and self-proclaimed interim president of Venezuela Juan Guaido, left, on Feb. 8, 2019 and Venezuela's President Nicolas Maduro, on Feb. 7, 2019, both in Caracas, Venezuela. Dueling concerts will literally set the stage for a showdown on Friday, Feb. 22, 2019, between Venezuela's government and an opposition vowing to draw masses of people to push humanitarian aid into Venezuela despite Maduro's objections. (AP Photos/Ariana Cubillos)
This photo combo of file photos shows opposition leader and self-proclaimed interim president of Venezuela Juan Guaido, left, on Feb. 8, 2019 and Venezuela's President Nicolas Maduro, on Feb. 7, 2019, both in Caracas, Venezuela. Dueling concerts will literally set the stage for a showdown on Friday, Feb. 22, 2019, between Venezuela's government and an opposition vowing to draw masses of people to push humanitarian aid into Venezuela despite Maduro's objections. (AP Photos/Ariana Cubillos)
Map shows the various humanitarian aid points around Venezuela and borders which have been closed; 2c x 4 1/4 inches; 96.3 mm x 107 mm;
Map shows the various humanitarian aid points around Venezuela and borders which have been closed; 2c x 4 1/4 inches; 96.3 mm x 107 mm;
Secretary General of the Organization of American States, Luis Almagro, arrives at the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Secretary General of the Organization of American States, Luis Almagro, arrives at the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Venezuela's self-proclaimed interim president Juan Guaido, center, arrives at the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Venezuela's self-proclaimed interim president Juan Guaido, center, arrives at the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Spanish singer Alejandro Sanz performs in the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Spanish singer Alejandro Sanz performs in the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Colombian Army snipers cover the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Colombian Army snipers cover the Venezuela Aid Live concert on the Colombian side of the Tienditas International Bridge near Cucuta, Colombia, on the border with Venezuela, Friday, Feb. 22, 2019. (AP Photo/Fernando Vergara)
Government supporters flash heart-hand signals during the "Hands off Venezuela" concert at the Tienditas International Bridge, in Venezuela on the border with Colombia, Friday, Feb. 22, 2019. Venezuela's power struggle is set to convert into a battle of the bands Friday when musicians demanding Nicolas Maduro allow in humanitarian aid and those supporting the embattled leader's refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are being stored. (AP Photo/Rodrigo Abd)
Government supporters flash heart-hand signals during the "Hands off Venezuela" concert at the Tienditas International Bridge, in Venezuela on the border with Colombia, Friday, Feb. 22, 2019. Venezuela's power struggle is set to convert into a battle of the bands Friday when musicians demanding Nicolas Maduro allow in humanitarian aid and those supporting the embattled leader's refusal sing in rival concerts being held at both sides of a border bridge where tons of donated food and medicine are being stored. (AP Photo/Rodrigo Abd)