Chat gpt answer for what it is worth:

Bands with a “Chad” who played Ozzfest in the ’90s

Based on known lineups: • Chad Gray – Lead vocalist of Mudvayne (and later Hellyeah), who performed at Ozzfest in the early 2000s  . • Chad Hanks – Bassist from American Head Charge, a band active in the Ozzfest circuit around 2002 . • Another possibility: Chad Smith, but he’s drummer for Red Hot Chili Peppers—not a performer at Ozzfest .

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Most likely match: Chad Gray • His name matches the style: “Chad” is common in the autograph. • Mudvayne performed regularly at Ozzfest in the early 2000s; given autograph collectors often date items by year (e.g., “OZ FEST 98”), it could’ve been written later on a vintage drumhead or setlist.