Queen's Day in the Netherlands may elicit the greatest concentration of good vibes on the planet.*
This photo shows some of the action on the canals, which are packed with boats playing music:
Economists say that people facing high marginal tax rates on their income will tend to work less.** I'd say that this is backwards: people who don't want to work so much (and want to party more) tend to support higher taxes on those who work "too much."
I think I agree with this tradeoff :)
* Burning Man only has 40,000 people; probably 80 percent of the 16 million Dutch go out for a party on 30 April.
** Harvard Economist Greg Mankiw has said this; plenty of people want higher taxes, so we can hear less from him.