From the R to R Wire:

All reserved tickets to the July 4th concert featuring The New Pornographers with Midlake at Battery Park that have not already been picked up have been released.

The good news is there is a second chance to get tickets: any remaining tickets (and supply is limited) will be distributed on a first-come, first-served basis starting at 9 am on July 4th in Battery Park near Castle Clinton. Click HERE for a map with the exact location.