Richard Branson said 300,000 would attend the concert.
Guaido has thrown all his weight behind a "humanitarian channel" that would bring tons of much-needed aid from foreign countries into Venezuela.
"I think that if we can persuade the soldiers to open the bridge, that's the ideal outcome from this concert", he said in an interview via satellite link from the Mojave Air and Space Port in California. Firstly, because of the number of people who are going.
The US considers Maduro usurper and recognizes as the head of state the self-proclaimed acting president Juan Guaido, whose opposition group is the designated receiver of the "aid".
"Confirmed - it's rolling", the spokesman said of the collection operation announced Wednesday by Guaido, who has been recognized as interim president by more than 50 countries.
Maduro, who is facing growing worldwide pressure to step down after his disputed re-election past year, denies there is a humanitarian crisis and has blocked the bridge leading from Colombia to prevent aid getting through.
This trip will be Pence's fifth trip to Latin America as Vice President.
Maduro made the announcement on state TV, surrounded by military commanders before opposition leaders led by Juan Guaido vowed to bring in USA supplies of emergency food and medicine over the socialist president's objections.
Bernie Sanders, a self-avowed Democratic socialist, refused to call for Venezuelan leader Nicolás Maduro to step down Thursday.
"I don't think that Roger Waters is the best expert when it comes to what's going on in Venezuela".
Donations to the event will be received online and via direct deposits. Though Guaido has said he has made provisions to transport the supplies once they're allowed into the country, it's not clear what he would do, should that deadline come and go without being acted upon.
The border with Brazil - which along with Colombia is one of the main potential avenues for aid delivery - would be "completely and absolutely" closed from 8pm (00:00 GMT) until further notice, Maduro said.