Train and lead singer Patrick Monahan join Maroon 5 and Gavin DeGraw at Merriweather Post Pavilion on Aug. 24. (Steve Marcus Reuters)

Tickets go on sale Thursday at 10 a.m. through Ticketfly for the following shows at the 9:30 Club:
RX Bandits and Maps & Atlases July 9 ($20).
Interpol and School of Seven Bells July 13 ($40).
Stephen Marley and Ghetto Youths Crew July 14 ($26).

Tickets go on sale Friday at noon through Ticketmaster for the following shows at the Birchmere:
Kasey Chambers July 9 ($29.50).
Dave Koz July 20 ($49.50).
Tim Robbins & the Rogues Gallery Band July 27 ($29.50).
Eric Johnson Aug. 9 ($35).