They're holidays. Days of rest. There's lots of 'em. They mark 'em in red on the calendar so you can't miss 'em.
8 seconds sound clip from the Holiday Inn (1942) movie soundboard.
You can hear this line at 00:08:28 in the Blu-ray version of the movie.
Quote context
[...]
- Can't you see what we're walking out on? The grind. 365 days a year.
- When's the last time you had as day off?
- I don't know. Maybe last year?
- Do you ever hear of Thanksgiving or Labor Day or the Fourth of July?
- Vaguely.
- You know what they are, don't you?
- What happens in show business when a holiday comes along? You give an extra performance.
- Lila and I are going up to that farm in Connecticut and we're gonna live by the calendar.
- Say, Jim? There's something you should know.
- Oh, I know, Ted. I feel the same way about you.
[...]