The sound tech at church never gets thanked on stage, but nobody would hear a word without them.

Some work is only visible when it fails. Nobody thinks about microphones until one squeals, so the entire reward for doing that job well is that you remain invisible, which is a strange arrangement to keep volunteering for. The same is true of whoever opens the building, fixes the printer or sorts out the bus. Competence erases its own evidence.

Pick the person whose work you only notice when it breaks and thank them this week. Be specific about what would be different without them. Learn their name first if you do not know it.