How to write an invitation when you are admitted to a university and invite your classmates to dinner?

Indicate the invitee, reason, time and place.

Extended data:

An invitation letter is a ceremonial document issued to invite relevant units or individuals to participate in an activity. According to the size of space, the number of words and the simplicity of content, it can be divided into two forms. Large space, many words and complicated contents can be called invitations and invitations. The words are few, the content is relatively simple, and the printed invitation is beautiful. Invitations, also known as "invitations" and "Cambodian invitations", have different forms. Invitation is not only a traditional etiquette document in China, but also a common social way in the world. It's impolite to ask someone to forward the invitation, and the delivery method of the invitation is very particular.