firstnighter

or first-night·er

[furst-nahy-ter]

noun

a person who often or usually attends the theater, opera, etc., on opening night.

Origin of firstnighter

First recorded in 1880–85; first night + -er¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for first-nighter

Historical Examples of first-nighter

He was not a "first-nighter," but dropped in to see a new piece whenever he wanted copy for his feuilleton.
Aspects and Impressions
Edmund Gosse
The stage claimed a great part of my attention about this time, and I became an inveterate "first-nighter" in my holidays.
Forty Years of 'Spy'
Leslie Ward

British Dictionary definitions for first-nighter

first-nighter