If you look at sets, an event is a member of a collection (called a sample space). Think of any possible result in your experiment. The outcome that ends up happening is a kind of event.
Example: A mother gives birth to two children. The child can be a boy or a girl. There are four events that make up the sample space that shows every possible outcome of birthing two children:
Example: Three coin tosses. A coin has two sides, Heads (H) and Tails (T). There are eight events that make up the sample space that shows every possible outcome of the three coin tosses:
Example: I have a bag of 20 marbles. 7 are red, 5 are white, and 8 are blue.
I can pick any marble out of the 20, but the event of pulling a red marble has a probability of 7/20 (since that event can happen 7 times out of the 20), the event of pulling a white marble has a probability of 5/20 (since that event can happen 5 times out of the 20), and the event of pulling a blue marble has a probability of 8/20 (since that event can happen 8 times out of the 20).
The "below" in the phrase "event below" doesn't have statistical meaning. Your assignment has a prompt/instructions, and the event you need to do calculations for likely shows below on the paper, in another paragraph or line, for example.
I hope this helps! Please let me know if I can clarify anything.