You clear a space on your CALENDAR.
There will be an inquiry.
The Big Bang Theory Season 1, Episode 6
Boy, if we can get him to do that CALENDAR,
this will be the best day ever.
The Big Bang Theory Season 6, Episode 22
Don't you maniacs own a CALENDAR?
The Big Bang Theory Season 10, Episode 12
Really? You're changing
the Sheldonian CALENDAR?
The Big Bang Theory Season 4, Episode 2
...make him take 12 pictures with us
so we can make a CALENDAR.
The Big Bang Theory Season 6, Episode 22