rag-week

listen to the pronunciation of rag-week
Englisch - Englisch
Attributive form of rag week, noun
The days of the month when a woman has her period

I wouldn't bother trying to get off with her – it's rag week.

An annual event in many (mainly British) universities where students engage in unusual activities to raise money for charity
rag: a week at British universities during which side-shows and processions of floats are organized to raise money for charities