Final Year Puzzle

The three meta answers combine to give the phrase "FIRST UC BERKELEY CLASS", which clues the year 1873.

When teams submit the year, someone from HQ comes to visit them, and explains that s/he is a time traveller: "I got the note you left at Founder's Rock. I'm from the last class at UC Berkeley. You see, the zombies have completely taken over Cal, and we don’t know how to stop them."

The zombie comes in and menaces the team, but the time traveler scares the zombie away.

The time traveller says "Whew that was close. Would you help us figure out how to stop them?" Then teams receive the final puzzle [[ PDF ]].