All public performers, pro or amateur, should ensure that each of their performances is recorded - excellent pocket sound recorders are very affordable nowadays. You can then be your own crit - listen to the recording as if of strangers. Or ask your mother-in-law.

"How good was it, in absolute terms?" is one question, "Is that good enough for the event?" is the other, obviously depending on the character of the event and how it is advertised and announced.