The Trans-Siberian Orchestra – or “TSO” as its loyalist followers call it – comes to Rocket Mortgage FieldHouse for its annual concert on Dec. 30. This holiday extravaganza brings together classic Christmas tunes with a slightly hair-metal twist. If you’ve never been, this is your chance. Check out either the 3 p.m. or the 8 pm. show. Big rocker hair not required.