Do I need the article "the" before festivals in the sentence.

Yes, I believe that you would use the word "the" in all of these cases.

Thank you soooo much , teacher Trellis! ^o^

It was my pleasure. )

I think the main reason is these expressions of Chinese festival all consist of common English words.

Am I right?

I think "the" is required if form is "the ___ festival."

That said, I think that "Chinese New Year" does not take the "the". After all, named holidays like New Year's Eve, Christmas, and Easter do not take a "the".

I have been giving more thought to your question over the past few days.
My reply may have not been totally accurate.

In the USA or UK one would say, "I am celebrating Christmas",
and not, "I am celebrating the Christmas".

If you added the word "holiday", which is like "festival",
then it would be "I am celebrating the Christmas holiday".

So, as I tol

Hello Deep Blue,

I had been thinking that my reply here, three days ago, was not entirely correct.
Your post nudged me into typing a more complete reply.

I made the reply to the original questioner so they will get it in their email.
You can read it at the web page.

Thank you for pulling my attention back to this unresolved question.

Not at all.

Is any festival like diwali take article or not?

There is a rule for using definite article before the names of festival like, festivals+holidays or vacations

Example, He came in the dashain holidays.