I had to phone the secretary anyway with another query, and I also asked if it was possible to find out entry numbers and they said they don't give out that info. Hey ho, just wondered :)
We do too, can't see why not. However the absentee rate at open shows can be very high so it is best not to take too much notice of the numbers entered before you are due in the ring, that way you will almost certain to miss a class sooner or later.