Fasting..gotta be done during ramadan.
From dawn till dusk, no food, no water. Then you may eat.
There is Hajj. Where you have to visit the holy mosque in Saudi Arabia. It is cool, I went there once. There is Umrah. Its also a visit to the holy mosque and stuff, but its a bit shorter. There is eid - ul - fitr and eid - ul - adha. Eid ul fitr is the celebration after a month of ramadan. Just exchanging gifts and stuff..kinda like christmas. Eid ul adha is when we have to sacrifice a goat in name of allah. It doesnt get thrown away obviously. Eaten and shared amongst friends and family.
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And that is basically all the major events and holidays that come up in ramadan.