Step 1: Volunteer to throw a Cinco de Mayo party for your child's second grade class. On the Cuatro de Mayo, of course, since the Cinco isn't a schoolday.
Step 2: Plan it out - video explaining holiday, book to read aloud, two crafts (paper lanterns and tissue paper flowers) and snack (Mayan chocolate ice cream, Dulce de Leche ice cream, and gaseosas, carbonated fruit juices, to drink).
Step 3: Ask two other parents to help you.
Step 4: Day of party, watch the children's eyes light up as you take the supplies from your bags. Begin to hear whispers as you pull the tall, green glass bottles of gaseosa out.
Step 5: Halfway through serving gaseosa, hear one word of the whispers become audible: wine. Understand that the children think you are serving them wine. Attempt to convince them otherwise. Fail.
Step 6: After party, go home. Wait for phone to ring.