If you or your artist has overstayed on a P-1, P-2 or P-3 visa,the artist could be a subject to the inadmissibility bar. The rule of thumb is to never stay in the US beyond the date stated in the I-94. If the visa is overstayed there are several consequences.
First, an artist is not employment authorized after the I-94 or visa expiration date. It means that the artists can no longer perform in the US.
Second, a P visa artist may be subject to the inadmissibility bar. If an artist or an entire band has overstayed for over 6 months, they will not be able to return to the US for 3 years! This is serious consequence. Please note that even if an experienced entertainment visa attorney filed a proper visa with USCIS and it gets approved, the artist will no be able to get a visa at a local embassy or consulate.