These are customs, not strict rules
Concert etiquette exists mainly to help performers concentrate and to preserve the listening experience for the whole audience, rather than being a rigid set of rules β most venues and fellow attendees are understanding toward first-time concertgoers who are still learning the customs.
Frequently Asked Questions
What happens if I accidentally clap between movements?
It happens fairly often and is generally not considered a serious faux pas β most audiences and performers understand that newcomers may not be familiar with the convention, and the moment usually passes without much notice.
Is it OK to leave during a performance if needed?
It is best to wait for a natural break, such as the end of a piece or intermission, if at all possible, since leaving mid-performance can be distracting to performers and other audience members seated nearby.