It wasn't the best GP, but I took six people to it, with five who had never seen it before. They all loved it.
Riga is different to other tracks in that it's very sandy, so it doesn't behave the same way. I don't think the track prep changes to accommodate this.
The first block of racing you really needed the inside line. The second and third blocks of racing (heats 5-12) probably gave the best racing last night, and I'd say it's because dirt had started going out wider, but hadn't gone too far. This has happened at Riga before. The very outside line at Riga is too far wide, so you have to bring the dirt back in to the middle of the track. There, you get riders using the inside and middle lines. But once it's pas the middle, the inside line is by far the best line.
There was no effort to move the dirt back to the inside, and it really hurt the racing later on.
The other issue is the gates are very uneven. Gate 4 starts well, but as the racing goes on, gate 1 becomes clearly the best gate. Gate 2 gradually improves and gate three is like treacle. This is compounded when the track prep doesn't create the conditions you need for a good outside line.