"Celebrationizing sounds complex. How do I do it?"
If you are a citizen of the EarthPlanet: Clear your calendar for the last weekend in April. Start working on that costume. Trust your good-times instincts. Don't hold back.
If you are a member of the business community:
Offer something for free or at a discount exclusively for anyone in costume on the last weekend in April. Your business and promotion will be advertised on this here website. Bars: Think Halloween meets New Years Eve meets your 9th birthday party. Get creative! .