Have rules for canceling the meeting when appropriate - if such-and-such doesn't happen, if only a certain number of people can attend, etc.

规定适当的条件下取消会议——如某某事不发生只有可以参加的人数够等。

youdao

Last Thursday, August 30, he abruptly and unexpectedly returned to Taiwan, canceling a meeting with Sharp CEO Okuda Takashi and a scheduled press conference.

FORBES: Hon Hai May Be Walking Away From, and Dooming, Sharp