If those concerns are real, then I know where NOT to fly.
Its certainly worth going to and I'll be going again
I've happily been into many events where the skies are full in the circuit. My only problem with Sywell is that the instructions are massive and lots of people don't bother to read them.
I really don't like the Pitsford hold. It's worse than an OHJ and very difficult to spot traffic. The only radio call is on finals so you don't build up much of a picture of what's about.
Faster aircraft are mixing it with slower as they stream to the same finals position and only then do you know if the aircraft in front or alongside is positioning for the grass or the hard.
It's a real test for the Mk1 Eyeball!