Let's seeee, I don't imagine it to be too large a fanfare, the way the Janitor meets the faeries. Little pixies work all over the college, so it was only a matter of time for the pixies to take notice of the Janitor as they go about cleaning up the place and cleaning it good. The little faeries were being their curious selves and spying on the Janitor. The Janitor absolutely knew they were there, but just pretended to ignore them because they had work to do and they were going to do it right. After some time, they started leaving little sugary treats in little nooks and crannies. Nothing too big, and then that leads to the faeries going out of their way to do little things for Janitor right back. Just a cute pattern of the Janitor doing a nice thing and the pixies doing a nice thing back.
And then, one day, Janitor just started tapping a beat, whistling while they work being in a good mood, and the faeries started to do a little folk song to that beat. Eventually, it just escalated into a full on party of which the Janitor was guest to. Got to witness all their little songs and dances while they continued to clean the place up. It was a very, very fun time for everyone.
Afterwards, the Janitor began to study the pixie language on top of all their other self-study subjects. Wouldn't it be nice to actually know what the lyrics to their folk songs contain? The faeries also stopped hiding away from the Janitor as often. In fact, it's a little weird to not see someone trailing behind them, over their shoulder, or on their head. And it's almost disturbing to see the Janitor not have at least some light dusting of gold dust.
Soooo yeah, it's basically a cute disney-esque meeting