I left out the following sentences.Thank you very much.

1) The day after Christmas my uncles from Liguria visited us.
2) The day after their visit I started my homework and I did't manage to finish it before the beginning of the school.
3) On 30 December I was with a group of friends.
I spent the rest of my holiday meeting my friends, doing homework and going to callisthenics practice.
4) On Epiphany Eve the "kindly old woman" brought me many sweets and a pair of earrings.
5) On the next day I sid my homework.
On 8 January I went back to school as all my classmates (did)

Check for comma needs and for spelling. Repost only 2 or 3 that you may be unsure of.

No problem! Here are the missing sentences you mentioned:

1) The day after Christmas, my uncles from Liguria visited us.
2) The day after their visit, I started my homework and didn't manage to finish it before the beginning of the school.
3) On December 30, I was with a group of friends. I spent the rest of my holiday meeting my friends, doing homework, and going to callisthenics practice.
4) On Epiphany Eve, the "kindly old woman" brought me many sweets and a pair of earrings.
5) On the next day, I did my homework. On January 8, I went back to school, just like all my classmates did.