We often use no article with the names of holidays or other special (or even not so special) days: Valentines Day St. Patrick's Day Labor Day Memorial Day Taco Tuesday casual Friday We might use an article (or some other determiner) to be more specific about which of those days we're referring to: ...the first Valentine's Day after we got married... ...the last Labor Day before I graduated... ...his first Christmas... ...the last Taco Tuesday ever if you guys don't clean up the mess in the break room...

I agree holidays do not take an article. In Stewie's response, "It's parachute day," Parachute Day is one thing like Christmas Day and hence no article. He could have said, "It is a parachute day." That day would have been one of many parachute days. Gymboree probably has more than one parachute day and using the article would be correct. You do hear the dropped article for other "special" days that are not properly holidays. Examples "It's movie night," "It's pizza night" You could use the indefinite article here, but will usually hear it dropped. Hope that helps.