The title says all. In very simple terms.

Today I arrived home to find that I had been invited to a friend of mine's bar mitzfah. Now, I have never been very religious and hardly know a thing about my family's religion, so how am I supposed to understand how someone else's works? Sure I know the basics, like what a bar mitzfah, but I don't know what happens during them.

I'm already awkward. It's on April 20th and I'd appreciate anyone's help, just so I don't show up a complete and utter derp.