Well in case of the most important game for participated countries should be treated with respect to NT managers and repective communities long term work and any changes chould be telůgrapshed in advance and BBs shjould double chceck NTs got the info. Especially if it happens during weekend. Hard to tell which would frustrates more people - denied climax of the season for respective communities or slight delay iof new season processing. They knew how it is with season updating and could moved those matches to prior dates much much sooner and it would be a no deal.
It is a rule of thumb - if someone knew he/she is ok to set thing up one day ahead on Sunday you should expect he/she will do it unless they told you otherwise.