中译英：会议要求大家准时到场

会议要求大家准时到场

非要用demand of的话：

We are demanded of complete punctuality to the meeting.

其他：
Your punctual presence is required.

Everybody is requeired to attend the meeting on time.

The conference demands everyone arrive on time.

Punctual is necessary.

Punctuality is required!

or

Please be on time!