No official permission has been given for the event to take place.

这项活动未得到正式批准，不能进行。

《牛津词典》

He told me that I had no business being in there without official permission.

他对我说，没有官方的许可，没有理由去那儿。

youdao

Do you think it necessary to ask for official permission for the event to take place?

你觉得进行这项活动，有必要得到正式的批准吗？

youdao

Aung San Suu Kyi is on trial for violating the terms of her house arrest by allowing an uninvited American man to stay over without official permission.

VOA: standard.2009.06.19

Aung San Suu Kyi is now on trial for allowing an uninvited guest to stay in her house without official permission and is expected to be sentenced to up to five years in prison.

VOA: standard.2009.06.09

Journalists were prohibited from entering Chechnya without permission and had to travel with an official escort.

VOA: standard.2009.04.16

Interior Minister Sadeq Mahsouli said that any demonstrations needed official permission, and none had been given.

BBC: Ahmadinejad wins Iran presidential election

For a fee, official permission in Russia can be forthcoming for the most questionable activities.

ECONOMIST: Money laundering in Russia

Despite significant risks, we have entered Syria without official permission on several occasions to investigate alleged violations.

CNN: Tracking down torture in Syria