Security tightened at Boston Calling over ‘Molly’ concerns

Emily Wright/Boston.com staff

The two-day Boston Calling Music Festival returned to City Hall Plaza after May's inaugural event.

Josh Reynolds for The Boston Globe

Security was tightened because of recent drug overdoses at concerts in Boston and New York, organizers said.

Matthew J. Lee/Globe Staff

Tickets were still available Saturday evening for Sunday's performances.

Matthew J. Lee/Globe Staff

Local Natives will head on to St. Louis for LouFest. Pictured: Lead singer Taylor Rice.

Matthew J. Lee/Globe Staff

The Gaslight Anthem was one of the acts to perform at the festival.

Matthew J. Lee/Globe Staff

Vampire Weekend concluded Saturday along with The Gaslight Anthem. Pictured: Ezra Koenig of Vampire Weekend.

Alexa Dibenedetto/Boston.com correspondent

Bearstronaut performed during the festival's second day. Pictured: David Martineau.

Alexa Dibenedetto/Boston.com correspondent

Royal Teeth got the crowd to sing along.

Josh Reynolds for The Boston Globe

Ben Shipley of New York City and Blair Nodelman of Albuquerque, N.M., were at City Hall Plaza on Sunday.

Alexa Dibenedetto/Boston.com correspondent

Big Black Delta's next performance is Sept. 17 in Los Angeles. Pictured: Lead singer Jonathan Bates.

Matthew J. Lee/Globe Staff

Fans enjoyed the music of Major Lazer during their performance Sunday.

Matthew J. Lee/Globe Staff

Diplo (right) and Walshy Fire of Major Lazer got the crowd going.

Matt Juul/Boston.com correspondent

A huge crowd gathered to watch rapper Kendrick Lamar perform.

Matthew J. Lee/Globe Staff

Lamar will perform Monday at Brooklyn's Williamsburg Park.

Matthew J. Lee/Globe Staff

Homegrown group Passion Pit was one of the headlining acts. The other was Vampire Weekend. Pictured: Lead singer Michael Angelakos.