Where is it advertised that the Hydrotherapy Pool ...

Where is it advertised that the Hydrotherapy Pool is booked from 9 to 1pm for lessons on Sunday Morning. The new program for hydro pool starting 3 Aug. only shows Mond. to Frid. Rather confusing.I turned up at 11.15 to be told that pool was booked but there was nobody in it .There was a notice board at poolside saying classes.Should it not be a good idea to have the sign at entrance to Building.