One's 21st birthday is marathon, not a sprint. It should be celebrated over the span of hours or possibly days. A celebration of this caliber has multple stages.
1. The anticipation
2. The first purchase
3. The placing of the sash
4. The pregame
5. The first bar
6. The last bar
7. The morning after
8. Coffee
9. Need more coffee
10. Nap time