1.Peter is a good fun and we all enjoy being with him
改为Peter is a humorous/funny person,so we all enjoy staying/being with him.
2.In the world,some festivals are held to honour the dead,or to satisfy and please the ancestors,who could return eigher to help orto do harm .
Some festivals are to commemorate(纪念) the dead,some are to satisfy or please the ancestors(语法正确,但祖先一般不与满足和取悦相搭配,最好用memorize and thank) ,who could bless us from harm.(保佑我们免遭灾害)