Thirty-two adults and one juvenile were arrested and charged with possessing and distributing drugs at a concert Saturday night at Merriweather Post Pavilion.

Howard County police said the 33 were arrested by uniformed and undercover police at a concert featuring Trey Anastasio. Police said 16 adults were charged with distribution of drugs and 17 adults were charged with possession (one of those also was charged with distribution). The juvenile was charged with possession.

Police said they seized LSD, Ecstasy, opium, hashish and marijuana.