A critical category applied by Martin Esslin to a body of plays, mainly from the 1950s and 1960s, rather than an organized movement with a founding or dissolution date; sources describe its era loosely without naming a closing year.
What would resolve this A literary-historical source identifying a specific closing work, event or year for the Absurdist theatrical period, or explicit confirmation that the category has no closing boundary.
OpenTheatre history and periodization scholarshipTheatre of the Absurd (Wikipedia)