Which is how I'm assuming they're getting these printed regardless of how they're created/generated. My point was that people often don't generally have these things on hand where they're working on them. I haven't used a library computer in a very long time, but so far as I know they're usually very locked-down devices suitable only for Web access.
Again, my point is that - assuming it's not a big-budget event - they're trying to do this quickly to avoid taking too much time away from all the other aspects involved in planning & setting up such an event. The idea is just to get the word out, not make a masterful presentation on paper about it. For quick one-off out-of-the-daily-routine tasks, I can understand going this route.