dear mr./ ms. **：
i am writing an invitation to you to join the banquet we host for you.
all of my classmates feel it a great honor to have been your students in the past three years. thanks to your patience and devotion, we benefited a lot from your class. time flies. now, it's time to say goodbye. despite the near departion, we would like to invite you to have dinner with us in order to express our gratitude to you. all of us are looking forward to this banquet with your presence. please do come.
best regards.
yours, **
