Things Celebrated in March

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Across
  1. 3. The number of diameters that make the circumference of a circle
  2. 5. The symbol of luck, affiliated with March 17th.
  3. 6. The last name of the man who wrote the Cat in the Hat.
Down
  1. 1. The protectors of teeth have a holiday this month.
  2. 2. Who run the world? (And have a holiday March 8)
  3. 4. Those working under CEOs and entrepreneurs, born in 1964, who are under appreciated have an appreciation day.