SANTA CRUZ — A speaking engagement with former first lady Jill Biden scheduled for Saturday at Kaiser Permanente Arena was abruptly canceled. No reason for the cancelation was given, and calls to the Santa Cruz Warriors’ office were not returned by deadline Tuesday. A message on the Ticketmaster website said the event had been canceled but indicated that those who already purchased tickets do not need to take any additional action. If tickets were transferred to a patron, the refund will go to the person who purchased the tickets from Ticketmaster. Jill Biden served as first lady when her husband, Joe Biden, served as president from 2021 to January of this year, and as second lady from 2009 to 2017 when Joe Biden served as Barack Obama’s vice president.