Web alarm clock for 9:15 p.m.
While you wait for the signal to bring out the chairs for evening Mass, set this alarm for 9:15 pm and keep an eye on the clock without hovering by the storage area. The time leaves 45 minutes before 10:00 pm, enough to arrange the chairs carefully and clear the aisle before the next hour begins.
Preparing the chairs may take you away from the phone just when the alarm sounds, so check where its audio is going. Wireless earphones can remain connected inside a pocket or bag, sending the alert somewhere you cannot hear it. Disconnect them or place them where the tone will be obvious. Keep this page active and the phone awake as well: if the browser closes or the phone sleeps, the chair reminder may never sound.
As parish activity settles later in the evening, voices near the entrance may fade while scraping chairs and passing traffic become easier to notice. Put the phone on a firm surface close to your route from storage to the seating area, with the volume above the surrounding noise. At 9:15 pm, that position makes the alert easier to catch without disturbing people already preparing quietly for Mass.