New Orleans’ Crowbar and Eyehategod helped define sludge metal, and Thou is one of the titans of the genre. The three heavyhitters share a rare bill together on Saturday, Aug. 30, at Southport Hall.

Admission for those who need to pay at the gate is $20 general admission or $17 for seniors 65 and older. Discounts are available by buying tickets in advance online. People ride the Wave Swinger ...