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同学你好~
End of news bulletin.Television announcer showed viewers fields-Calibria, where macaroni has been growing for over six hundred years.
Calibria → Calabria（意大利地区正确拼写）。
has been growing→ has been grown（通心粉是“被种植”，需被动语态）。
fields-Calibria → fields in Calabria（需介词连接）。
End of the news bulletin. The television announcer showed viewers fields in Calabria, where macaroni has been grown for over six hundred years.

Harvesting has began earlier this year than usual.
has began → began（过去式，无需完成时）。
Harvesting began earlier this year than usual.

For the whole village has been working hard day and night ,gathering and threshing this year' crop before September rains.
For the whole village...→ The whole village has been...（删除多余连词 For）。
year' → year’s（需所有格符号）。
before the September rains。
The whole village has been working hard day and night, gathering and threshing this year’s crop before the September rains.

Then, crop is processed in factory.
crop → the crop；in factory → in a factory。
Then, the crop is processed in a factory.

After harvest, here is the famous Calabria macaroni-eating competition.
逻辑错误：here is → there is（客观存在用there is）。
After the harvest, there is the famous Calabria macaroni-eating competition.

Signor Fratelli, the present champion, which has won it each year since 1991.
关系代词错误：which → who（指人用 who）。
标点错误：需合并为复合句。
Signor Fratelli, the present champion, who has won it each year since 1991.

and that end of bulletin, we are going back to the the studio, today is April 1st,Thursday.
逻辑连接错误：and that → With that（过渡短语）。
重复冠词：the the → the。
时间顺序错误：April 1st, Thursday → Thursday, April 1st。
With that, the bulletin ends, and we return to the studio. Today is Thursday, April 1st.

错误写法：at present champion（语法错误）。
正确写法：the present champion 或 the current champion。
At present 是副词短语（= now），需独立使用，如：He is the champion at present.
Present作形容词时，须搭配冠词：the present champion。

祝同学学习进步~