班会 (bān huì) means “class meeting”

More examples

我们一起开班会。wǒ men yì qǐ kāi bān huì

We will hold a class meeting together.

A class gathers to make group decisions, discuss common matters, or do something together.

班会课bān huì kè: A class period for students in one class to discuss class matters or make plans together.

同班学生聚在一起，就班级事务进行讨论或者参加共同活动的会议tóng bān xué shēng jù zài yì qǐ jiù bān jí shì wù jìn xíng tǎo lùn huò zhě cān jiā gòng tóng huó dòng de huì yì

班会 (bānhuì, "class meeting") is formed from 班 (bān, "class") and 会 (huì, "meeting"), making its basic picture a meeting belonging to one class.

The word refers to a school event as a whole, including its shared discussion or activity, rather than only the notices given during that time.