Mary Chapin Carpenter will perform at the Birchmere on Oct. 3 and 4. (AP Photo/Russ Harrington)

- Mary Chapin Carpenter will perform at the Birchmere on Oct. 3 and 4 after Hurricane Irene put the kibosh on her recent concert at Wolf Trap. Tickets go on sale on Monday at noon.

- Peter Bjorn and John have canceled tonight’s concert at the 9:30 Club due to an injury and will reschedule for a later date. Meantime, the 9:30 is holding a pre-FreeFest bash featuring the Eclectic Method and Will Eastman. PB&J ticket holders will get in for free, FreeFest ticket holders will get in for free and the rest of us have to pay $10. Doors open at 9.