Related Clues:

• Can't refuse
• Are forced
• Can't-miss event
• Is compelled
• Is obligated to
• "It's a __-see!": "Don't miss it!"
• It's not an option
• 'No -- apologize'
• Non-negotiable
• 'There's no -- worry'
• Can't say no
• Simply must
• Event not to be missed
• Is required to
• Part 2 of today's quote