Someone who attends the theatre, especially one who does so regularly(noun)
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Use "theatregoer" in a sentence
"Or, if you're more of a theatregoer, the Olivier nominee Tender or its complex and equally lauded Splendour."
"Thankfully, they fetched a constable, and the constable, being a theatregoer, recognised him and fetched Tom."
"With a tightly-knit ensemble that has dug deep into their characters and found so much more than appears on the printed page, this production should not be missed by any serious theatregoer in the Bay area."