callout

An outgoing telephone call.

An instance of being summoned to visit a certain place in order to provide assistance; an instance of summoning someone who is on call.

I had to pay for the callout of the plumber after the pipe burst.

A meeting or rally held in order to find interested participants, e.g. for an activity or sports team.

So many people attended the basketball callout that the coach decided to form two teams.

An invitation to fight.

A request for people to join or take part.

[…] a callout for volunteers to fill hundreds of sandbags.