Web alarm clock for 9:56 p.m.
Before handing over the task of bringing chairs for the evening Mass, you set the alarm for 9:56 pm so the next person has a clear cue to start. That leaves enough time to confirm where the chairs are kept and who will carry them before 10:00 pm, without turning the handover into a long discussion.
Because someone else will act on the signal, test its sound while you are still together and can fix a volume or permission issue. Choose a tone that is easy to recognise, set the volume above nearby conversation, and run a brief trial before saving the real alarm. Keep the browser available and the phone awake: if either is shut down, the chair handover may receive no alert when 9:56 pm arrives.
As the incoming helper heads out for the chairs, mention that Philippine evenings can still feel humid even after sunset. At this hour, a few minutes outdoors may be more comfortable with a light, breathable layer rather than a heavy one. If rain has left the air damp, place a small towel near the chair storage area so wet seats or hands can be wiped before the chairs enter the church.