President Barack Obama's convention speech in Charlotte Thursday night is being moved inside because of the threat of severe weather.
The original venue, the Bank of America Stadium, seats more than 70,000 people. The new venue, Time Warner Cable Arena, can hold about 21,000.
More than 60,000 tickets have already been given out, which means thousands will not be able to attend.
Democratic National Convention organizers say they will hold another event before Election Day for those who will not be able to attend.