Using the gathering AI from the bell/siren, it may be possible to place an object that behaves like an automated bell/siren that silently goes off at a set time to move settlers to certain areas at specific times. This could be the start to a mod that adds AI to settlements that have meetings, parties etc. at different times throughout the day. More sophisticated behaviour would require F4SE, but it seems technically feasable, and would bring alot of life to settlements.