'That's what that flag is for,' he said at the Charlottesville concert organized by Dave Matthews Band
Here's how to donate to the Dave Matthews-organized show
'Every two seconds I saw a different white nationalist or Neo-Nazi group...'
The 25-year-old is being charged with 'abduction and possession of a firearm by a convicted felon.'
Band kicking off annual trek May 30 in Maryland Heights, Missouri.
Fans encouraged to donate to charity, not pay admission.
Group donates $4,500 to free-bike program in Charlottesville, Virginia.
Announced dates for band's North American trek, with more to be added, come on brink of release of fourth studio album, Everyday.
Ticket sales not strong enough to justify two shows, manager said.