yuēhuì ānpái kěyǐ biànhuà, dàn línshí jiā rén, huàn dìdiǎn, gǎi chéng hěn wǎn de huódòng, dōu yīnggāi xiān wèn duìfāng

约会安排可以变化，但临时加人、换地点、改成很晚的活动，都应该先问对方。

Date plans can change, but adding people, changing locations, or switching to a very late activity should all be asked about first.