Holding Classical music concerts

Holding concerts refers to organizing and hosting live musical performances where musicians or bands perform in front of an audience. Concerts can be held in a variety of settings, including concert halls, theaters, arenas, outdoor stadiums, and even in intimate settings such as cafes or clubs. I am very fond of classical music specially holding concerts. I attended many concerts in London and very enjoyed it. A long time passed that I attended any concert so, have no knowledge about schedule as concert will held anywhere or not? Now a days, I really want to attend a concert but have no information about concerts as it will held where and when? If anyone have information about it then kindly share with me.