I've been invited to perform in Zhuhai for 6 months do I need a visa traveling from uk

Yes, you need a visa, but since you will be working or something like that for a period of 6 months, you should ask about this subject at another section of the website (forum) where they deal with different types of visas. In reality, since you will be staying in Zhuhai for 6 months, you should consult a consular department of the Chinese diplomatic mission closest to your place of living.

You may need to apply for a Chinese work visa (Z visa). However, a work permit issued by Chinese authorities is necessary and this should be offered by your employer.