What is a Buddhist ceremony or service called, and what day of the week is it likely to be? I am a student at Manhattan College. I am in a class on religious discrimination. For my class I must go to a religious service other than mine. I picked Buddhism. However I don't know what a service would be called, or what day of the weekend it would be. I am lucky I have a monastery around the corner from me; what am I looking for?
In early times, (and still today in some Buddhist countries), laypeople would intensity their practice on certain days according to the lunar calendar. The special weekly Buddhist holy day is called Uposatha and it is observed on the new moon, the full moon, and the quarter moons. https://en.wikipedia.org/wiki/Uposatha

Today, particularly in the West where we don't use a lunar calendar, you are more likely to find a weekly, bi monthly, or monthly meeting at a fixed time. At the Laotian temple I attend, everyone is invited twice a month to a Sunday morning service which runs from about 9:00 am through about 1:00 pm. The most significant parts of the service include taking refuge, reciting the precepts, and offering lunch to the monks. In our tradition (Theravada), the monks don't eat anything after noon. So the lunch offered is quite a big event and an opportunity for people to give dana. 

But Buddhist meetings and services are not uniform and can be scheduled for purely practical reasons. A temple in my area has a Sunday morning service in Vietnamese and a Wednesday evening service in English. Another has a Sunday morning service in Korean and a Saturday Day of Mindfulness in English. Some groups meet for meditation and others meet for something that is more similar to worship. 

Best suggestion would be to call or stop by the monastery to see if they have services or events open to the public. The one universal rule is that shoes should be removed before you enter a monastery or temple. Have fun and be well. :)