By Wally Pyrah EXPECT plenty of celebrations and end-of-season parties when Happy Valley closes its curtain on the 2023/24 season, with another exciting nine-race programme starting at 11.35am today. It has to be said that for many form book students and regular bettors at the city track the season can’t end quickly enough, with unfathomable results a regular feature this term. Certainly, from Christmas onwards, there was a pronounced track bias favouring horses who raced up with the speed from the off, and then there was the unseasonable weather. In living memory, never has so much rain, thun…