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Frances will be praying one extra decade of the Rosary for Bishop Williamson's intentions for the next 15 days. That will make a complete Rosary. Those who wish to join in and be "counted" should PM by September 11. State that you have prayed one complete 15 decade Rosary or however many decades you've offered up.
This could be a successful idea, provided enough members participate.
The Universal Living Rosary Association of St. Philomena has been
doing this for about 150 years. It's best to have the mysteries
distributed too, as Our Lady arranges the 15 mysteries so that they all
get attention, like a good mother will for 15 children - they all need
individual attention.
The way the ULRASP does it is to assign a particular mystery to each
member, which they pray each day. But you could have them rotate
mysteries if you like, so that they cover them all in 15 days, only it's
best if all 15 are being prayed each day by some combination of people,
since it is the minimum of 5 Joyful or Sorrowful or Glorious mysteries
should be prayed each day by any one person, usually. So any group
effort should attempt to simulate that usual practice.