"Call a meeting" means the meeting starts right now. "Call an election" means the election should start sometime in the future.
"Call a strike" means the strike should start sometime in the future.
"Call a meeting" means the meeting starts right now. Possible, but unlikely. "The Head has called a meeting for midday." "Call an election" means the election should start sometime in the future. Almost always; elections generally take some time to set up.
"Call a strike" means the strike should start sometime in the future. Not necessarily.