Make a list of three things you have to do to get ready for the party using tener que + infinitive.

Tener que comprar
tener que acomodar
tener que invitar

Prepare, shower, get dressed, make food and drinks, send invitations (you can specify whether you're sending via email or not, doing that gets me extra points). You can also say little things like brush your hair or teeth etc. now put this into Spanish and you should be good.

I did this last year and she wanted us to add all the little things and those who did got more points.