Amendments 1 and 2 to the Sailing Instructions for Cowes Classics Week 2021 have now been published and can be downloaded from the Documents area of this website which can be regarded as a virtual regatta noticeboard (although there remains a physical noticeboard at RLYC).
There are also Briefing Notes for both Committee Boat and Shoreline Circuits available for download, also from the Documents area of this website.
You will find the Sailing Instructions along with the other event documents which are updated on a regular basis.