Is “ Eureka Day ,” a Tony-winning comedy now on the boards at the Pasadena Playhouse , as uproariously funny as it is because the script feels veritably ripped from today’s headlines? Or does it get its chuckles in spite of that pressing topicality? After all, not very many people are laughing right now about the battles over child vaccinations, which is the subject of the seriocomic arguments that erupt among a group of parents in Jonathan Spector’s script. But the fact that the play is now being presented as a period piece, set in the late 2010s, when it was first produced, puts us at just enough of a remove from the present madness to let down our guards and guffaw. If the climate hasn’t yet immunized you against that sort of thing.

The primary setting is a classroom at a progressi

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