The two people are Michael Scott and Rainn Wilson’s Dwight Schrute, wandering in lost while trying to locate a nearby paper convention.
From behind them, two people walk into the bar and get the usual service of being completely ignored by all employees.
The crossover episode would open with an exterior of Paddy’s Pub, with the voices of the five characters arguing over who is responsible for ordering the office supplies.
It’s the natural argument after Kaitlin Olson’s Dee wasted a bunch of paper while trying to print the rules for a new drinking contest between Charlie, Dennis, and Frank, which naturally involves 15 gallons of tequila and “all the hot sauce they have.”