Hi Ian
The schedule for that show will be published I expect in March and will give you the name of the person to contact with regards to booking in your entries and reserving a show pen. You can also pay on the day and collect your pen labels on the day, as long as you state so in your letter/email
The secretary changes with every show to give everyone a chance to do the different duties and to rotate it a bit. I currently know of about 5 people who it is shared between.