The weekend

Last sunday,I went back to visit the graves of my grandparents.There is different custom in every area of China. All the people visit graves at the Winter Solstice Festival ago in my country.in my hometown.

For the last part "in my country", I think you want you meant to say is "in my area, in my province, or in my hometown",(computer translation says hometown, so I think that's what you meant to say). Otherwise, you are implying that all the people in all of China have the same custom.