Since I don't know where you are, I suggest that you can google 'simon callow equus tour dates' and find out if and/or when he's coming to your area.
He'll be starring in a tour of 'Equus' by Peter Shaffer, the same version that Daniel Radcliffe appeared in in 2007.
Simon will play Martin Dysart, the psychiatrist, the role that Richard Burton played in the film, Alfie Allen (brother of Lily and son of Keith) plays the boy who blinds 6 horses. Also in the cast will be Linda Thorson.