I’m not sure what the announcement for the Advisory Committee on Immunization is all about for October 20, 21, 2021. It’s supposed to have 2 pages for the agenda and I see only one. The date in the agenda heading is “October 14, 2021” and the agenda has two dates: one for October 20 which is not about COVID-19 vaccine boosters and one for October 21 which says “Coronavirus Disease 2019 (COVID-19) Vaccines TBD.”
I suspect the ACIP will be discussing the Moderna and J&J vaccine boosters, which is what would follow the FDA advisory committee meeting decisions on October 14, 15.