Calendar in a sentence as a noun

They can still track him, read his email, know his calendar...

That's odd, I'm looking at my calendar and it doesn't say April 1st.

It's got the clunky mail client, it's got the calendar and you can invite people to a meeting/party.

I would not be "comfortable" if my calendar had 5 hours per day of status meetings and pointless chatter on it.

Calendar in a sentence as a verb

"As well as the 1700s, when France ran under a rationalized calendar, which provided the name for the Thermidorian Reaction.

HR scheduled a meeting 30 minutes in the future on my calendar, then informed me that my employment had been terminated because of the issue in my background.

Add the agenda as an attachment to the google calendar entry for the meeting and people can review/add to the agenda ahead of time, and then look back at it after the meeting for a reminder of what was covered.

Calendar definitions

noun

a system of timekeeping that defines the beginning and length and divisions of the year

noun

a list or register of events (appointments or social events or court cases etc); "I have you on my calendar for next Monday"

noun

a tabular array of the days (usually for one year)

verb

enter into a calendar