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calendar ยท console.warn

"{name}" is not a calendar event; expected o...

Printed by calendar, prefixed [lattice], since 1.83.0.

Warnings reference › calendar:event:*

Identifier
calendar:event:*
Raised by
calendar
Since
1.83.0

What happened

on() was called with a name the calendar never raises - a binding that can never fire, which is otherwise a silent no-op.

The fix

Use one of the calendar's events: card:click, card:dblclick, card:contextmenu, card:mount, range:change, beforeMove or card:move.

The smallest fix

calendar.on('card:click', (event) => { ... });

Reference

Covered in full at the API reference.