It's like the first cuckoo of Spring, or the first bottle of Beaujolais Nouveau across the English Channel - the first Frankfurt Book Fair appointment request of the year.
The first request for an appointment at Frankfurt I received this year arrived by email on 16 July courtesy of a UK book packager - exactly 13 weeks before the appointment (which I hope to attend).
(Come to think of it, that's a trimester if you're pregnant. Maybe news awaits me in Hall 8.)
When did you receive or send your first request? I bet someone can beat my date.