How can I ask for leave if I can't attend the meeting?

Inform in advance, write an email or send a text message.

1. Advance notice: If you know in advance that you can't attend the meeting, you can inform the meeting organizer or relevant person in charge as soon as possible, so that the other party has enough time to make adjustments and arrangements.

2. Write an email or send a text message: If you can't directly contact the meeting organizer or relevant person in charge, you can send leave information by email or text message. In the email or text message, briefly explain the reason why you can't attend the meeting and provide a substitute.