What if the leader who sent the invitation is not here?

If you invite the leader, but the leader is absent, you can take the following measures:

1. Leave an invitation and a short note explaining your intentions and requirements, as well as your contact information.

2. If time permits, you can try to send an invitation by email or social media to ensure that the leader receives the invitation.

If the leader doesn't reply to the invitation, you can consider contacting the assistant or secretary of the leader, asking about the leader and confirming whether they can convey the invitation to the leader.

If all attempts fail, you can consider sending a formal invitation letter to the leader and explaining in the letter that you have to take this measure because you have not received a reply.

No matter which method you take, you should be polite and respectful, and at the same time ensure that your invitation is conveyed to the leader in an appropriate way.