Easter Vacation?

You're welcome! That reminds me, the Imdb says the release date of this film was in November 1963. That simply cannot be true, because I clearly recall seeing this movie in the theater for the first time in May 1963 when I was going on 16 years old, right around the time I saw BYE BYE BIRDIE. They were both released around the same time, months before the JFK assassination.
Besides, that makes sense, because the subject of the movie was more timely in the spring than it would be in the late fall.

Dejael

In the early 1960s, Easter Week and Spring Break were at the same time, and became known to high school and college kids at the time as "Bal Week" named after Balboa Beach, where the kids would gather to party at the Rendezvous night club to dance to Dick Dale and the Deltones. The term "Bal Week" spread all over southern California, and equally applied to party weeks at Santa Monica and Malibu Beach all the way down to Palm Springs, where our story takes place.

Still, by the late 1960s, due to drug-using hippies and over-indulgent alcohol-consuming college students causing trouble, Bal Week was doomed. As the '60s wore on, students began to go to Palm Springs or the Colorado River for Easter Week instead of places around L.A. or Orange County. Today, Easter Week in Balboa is considered more of a family holiday than a high school and collegiate blowout.
Some Bal Week veterans say the last true "Bal Week" in southern California was in 1969, when one L.A. Times story reported that "the wild shenanigans that once marked Bal Week appear to have ended."

Dejael

That is true for universities- and private schools can have Easter break if they want to. But public k-12 schools used to be off on the Monday following Easter as the Easter holiday and can no longer do that (although some will have a "teacher work" day that day. They can't call it Easter Holiday anymore. Christmas is usually referred to as Winter Break.