Learn French: C'est la ville où il y a un grand festival. - This is the city where there is a big festival.

In French, où with a grave accent means "where" (or "when"). The accent doesn't change the pronunciation, but it's important for writing because it tells it apart from ou without an accent, which means "or". Here, it connects the two halves of our sentence: "the city" and what happens there.

Why is the adjective "grand" placed before "festival"?

Most French adjectives go after the noun, but grand describes size. Adjectives that describe Beauty, Age, Number, Goodness, and Size (often remembered by the acronym BANGS) are exceptions that typically come before the noun they describe.

Does "il y a" change if we talk about multiple festivals?

No, il y a is a fixed expression. It means both "there is" and "there are". Even if this sentence talked about multiple festivals, you would still use il y a.

Why do we use "C'est" to start the sentence instead of "Elle est"?

We use c'est (this is / it is) to introduce or identify a thing when it's followed by a determiner (like la, un, or mon) and a noun. Because we are pointing out a specific noun phrase (la ville), c'est is the correct choice.