https://livetalksla.stellartickets.com/events/robert-crumb-and-dan-...

VIRTUAL TICKETS (US Orders Only)
$50 Virtual Admission + signed book copy of the Crumb biography* (includes shipping to US addresses only). Includes access to watch the event on April 29 at 6pm PT/9pm ET and on video-on-demand for five days.
*signed by Crumb and Nadel..

Does not appear to be signed by anyone but the authors.