Answer:
We need to write an invitation to a party of 15.
"Hola! te invito a mi fiesta de 15 años este primero de enero! la vamos a celebrar en el salon de baile x, va a ser una fiesta hermosa!.
Espero que puedas venir! Anita"
A translation of this is:
"Hello! I'm inviting you to my 15 birthday this January first! It's going to be celebrated in the dancing room x, and it's going to be a beautiful party!
I hope you can come! Anita"