This is not your average get-to-know-you bingo. During the first week of school, students find classmates that meet certain math criteria to sign their bingo card in that particular box. Example: Find a classmate that has a birthdate that is a multiple of 4. You can decide to play this the normal bingo way, or change it up by having students find a new classmate each day throughout the first week of school.
I end this activity by asking for volunteers to introduce a classmate and share what mathematical thing he/she has learned about their peer based on the box that was signed.