Ai is going to have a monster chasing her around for the event. It's something of a riff off the Dancer shadows in P3 and P4 (I'd link pictures but apparently their so tedious no one bothered to cap them.) But basically her monster will be an entwined couple with mirrors for heads wielding a bullwhip in their joined hands. Despite having mirrors for faces her monster/shadow will be able to talk and shall do a lot of berating of her general behavior and a great deal of spilling how badly she wants to be loved. It may also toss out some of her less savory thoughts on people she's met and spoken too in the last month if she and it cross paths with your character.

If it happens to catch Ai or anything for that matter shield your eyes as the mirrors will reflect what little light there is between them and burn out everything inside their skull leaving some lovely char marks around the eyes, nose, and mouth. Best thing to do is run, since by rule of Persona the only way to get rid of her monster/shadow is for Ai to accept her dark side (which she's technically done back home but details) after another Persona user has totally wiped the floor with her shadow.

And when she isn't running away from her shadow/monster she'll be camping out in a temple, likely Delight because Delight is a good feeling. And/or she'll glue herself to the side of whatever stronger and more capable fighter she comes across outside of the temple. Good luck with her.

Anything else or you'd like to plot for the event hit me up over on plurk: Kitera.