The two hidden timed event characters are a guild senior you meet in front of the food store & a combatant of the Justice guild. Senior is given spiked coffee and works on report, gotta clear one of the Justice guild ladies for it to take effect (I left the Justice guild after being brought there and it worked). The combatant is sitting on the right side chair at the Justice guild and wants a snack from her buddy. He's on top of the mountain, where you can then spike it. Come back after clearing a few ladies and voila, you got the timed event ladies. The rest you can get at your own pace (the story will push you for progression).