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As previously mentioned there are three officially recognized religions in Iran: Islam, Judaism, and Christianity, each with separate but similar traditions.
Fasting/Food:
-Muslims observe Ramadan which is the month, determined by the lunar calendar, of fasting from sunrise to sunset.
-Jews observe two "major" days of fasting and other depravation: Yom Kippur, and Tisha B'Av, five "minor" fasts are prescribed however are not required of all Jews. The five are: The Fast of Gedaliah, The Fast of Tevet, The Fast of Esther, The Fast of Tammuz and The Fast of the Firstborn (required of only the firstborn males).
-Christianity does not require fasts as Islam and Judaism does. Fasting in Christianity is for the most part up to the individual to decide to do, the length, and type of fast (no solid food, no food/liquid). The most commonly held time of fasting is 40 days during Lent however requirements differ among traditions.
Pilgrimage:
-A fundamental part of Islam is the Hajj to be completed if physically and financially capable to Mecca.
-Judaism required a pilgrimage to The Temple in Jerusalem by all adult men until it was destroyed in 70. Now it is not required, however Jews commonly visit the Kotel or "Western Wall" by non-Jews, due to its significance.
-Christians are not required to make a pilgrimage, however numerous significant site across the globe are frequented for religious reverence.
"Islam." Wikipedia, the Free Encyclopedia. 24 Dec. 2011. Web. 28 Dec. 2011. .
"Christian Calendar." Christianity Site. Web. 28 Dec. 2011. .
Judaism 101. Web. 28 Dec. 2011. .