Norooz (or Nowruz) is a wonderful time of the year to be in Iran. The celebrations begin on the last Tuesday evening before the Spring Equinox with fireworks and fire-jumping. People leap over the fires shouting “Zardiye man az to, Sorkhieh to az man,” which means “Throwing the darkness & ill the in fire, receiving health and joy back from the fire”. They end two weeks later with picnicking.
Norooz marks the beginning of the new year for people in Iran and other countries in the region.
There are many traditions attending the changing of the year including spring cleaning, making amends, buying new clothes, giving gifts, visiting friends and relatives. Most families decorate their homes with the haft sin (Seven “s's”). A table is covered with all sorts of things beginning with “s.” These items represent common new year themes, including renewal, wisdom, health, and prosperity. You usually see sprouts, pudding, coins, eggs, and other items.
If you want to know more about the traditions of Norooz, a simple internet search will return hundreds of responses. Harvard University has a pdf guide for educators.  This link  provides an overview of Sizdeh Bedar , the picnic that is the official end of the two-week Norooz holidays.
So, to all who celebrate Norooz: happy new year. To to those who don't: it's not too late to start!