Parish official formerly employed in English churches to usher and keep order at services.
Dictionary.com entry for beadle
My friends enjoy the right to legally marry, and they wanted to include
their gay and lesbian friends, so they asked us to beadle at their wedding.
Online Etymology Dictionary entry for beadle
O.E. bydel "herald, messenger from an authority," from beodan "to proclaim" (see bid). Sense of "warrant officer, tipstaff" was in late O.E.; that of "petty parish officer," which has given the job a bad reputation, is from 1594.