Sometimes professional groups allow listeners to attend a rehearsal. Other organizations will invite you to attend special presentations or open rehearsals if you make a donation. You never know where a classical concert might crop up. Opera has been presented on farms in rural areas. Chamber music is heard on shipboard on special cruises.
Choruses invade shopping malls.
Keep your eyes and ears open. When Concerts Happen Classical music concerts can happen at just about any time, so pick the time that's best for you. There are more concerts on weekends, but in many cities you can find a concert almost every night of the week. Some downtown areas have special lunchtime or early-evening concerts to fit the urban work schedule. Student concerts in music departments may happen in the afternoon or evening, and sometimes even in the morning.