Yes, AUDIENCES is a Scrabble word!

Letter values in Scrabble US: A 1, U 1, D 2, I 1, E 1, N 1, C 3, E 1, S 1.

Is it a valid word?

AUDIENCES is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

a gathering of spectators or listeners at a (usually public) performance
the part of the general public interested in a source of information or entertainment
an opportunity to state your case and be heard
a conference (usually with someone important)