Indeed, Cinco De Mayo is..

preceded by Cuarto de la Pedo.

Correct.

I think there are little girls in white-lace head dresses lighting fireworks, with images/imágenes of skulls involved. I hear the crystal ones are highly sought and important.

I am informed you can purchase (outright) as in, right now, one of these young girls at the southern US border for the going rate of $3,500 US currently. Prices are expected to drop sharply by the merry month of May, however. Thank you, US gubmint.