in case of后跟名词时用冠词吗?

in case of后跟名词时用冠词吗?

可用可无，看情况来

例句
1. She had had the foresight to prepare herself financially in case of an accident.

她有先见之明，经济上作了准备以防万一发生事故。

Molly, my mother once gave me a special number to call in case of an emergency. “莫莉, 我妈妈曾给了我一个特殊的号码,让我万一遇到紧急事件时,就拨打它. ”
. Don't worry I will back your bill in case of problems. 别担心,万一遇到问题我会在财力上支持你的.

In case of failure, their position would be dangerous in the extreme. 万一失败, 他们的处境将十分危险.

Who owns the group name in case of dispute? 万一散团的话谁拥有团名的使用权?

这个得根据语境来判断，时态对应就行。你的例子因为前面用了brought，所以只能用过去时forgot了。