In Tameside different Numeracy Coordinators got together to organise half-termly Numeracy Networking meetings. These are held at a different school each time to allow us to move round and see what other schools do. At them we discuss ideas for implementing Numeracy across the Curriculum and issues arising in the development of Numeracy across schools.
We have also used these meetings to organise challenge days for students.
Feel free to contact me for more information.