Yesterday evening, on yet another hot Saturday night in the Bay Area summer, thrash metal titans Megadeth returned to the stage at Concord’s Toyota Pavilion on their “Destroy All Enemies” tour. The band was joined by theatrical nu-metal act Mudvayne – who brought a headlining performance to the same venue almost one year prior – and metalcore’s own All That Remains, making this show one of the year’s biggest and best metal lineups.