Ask where things are at KubeCon. Answers say the building, the level, and whether anyone has checked them.
Two boxes. The first is what you need. The second is where you are: a room, a landmark, or the talk you just left, so the answer can say whether you need stairs or an elevator.
Session titles, one per line, or the iCal text that Sched exports from My Schedule. Titles are matched to the programme; only the matched session ids stay, on this device, and the page says how many lines matched nothing.
Stored on this device until Thursday, sent with every page, never kept by the server. Only which sessions, never who you are.