They are only in the morning session.
In the morning session, Vice Chairmen Charlie Munger, Ajit Jain and Greg Abel will be available to answer questions from both the audience and Becky. Ajit handles insurance operations and Greg is in charge of all other operations. If questions are asked that are relevant to either of these areas, Becky or the on-premise questioner will get an answer from Ajit or Greg. Neither of them, however, will be available for questions at the afternoon session.
https://www.berkshirehathaway.com/meet01/visguide2022.pdf