On Wednesday, August 15, members of the Baltimore Symphony Orchestra (BSO) brass and percussion sections will perform a free outdoor send-off concert at the War Memorial Plaza ahead of the BSO’s international tour of Ireland and the United Kingdom. Baltimore City Mayor Catherine E. Pugh welcomes BSO Associate Conductor Nicholas Hersh and the BSO at 5 p.m. to kick-off the performance, which takes place on the War Memorial Plaza. This concert is the Orchestra’s last Baltimore performance before departing for the nine-day tour, which will be led by Music Director Marin Alsop and includes performances in Edinburgh, London and Dublin. Alsop and the BSO depart for the first international tour in 13 years, which includes debut performances at the BBC Proms and the Edinburgh International Festival.