Is it whole-school, or just done by Key Stage or Year Group?
Whole school, though events are by year group (except sometimes relay when they pit 2 together)
Just serious athletics events or fun/inclusive stuff too?
Definite athletics, but it doesn't feel serious
Is there more than one event going on at the same time?
Yes - there will be one thing on the track, whilst other year groups are jumping or throwing
Is it all organised and run by the PE staff, or do other staff get involved too?
Organised by PE. Dept, but loads of other staff involved (whole school is there, so no-one is teaching)
How do they decide who does which race?
Each child gets to state preferences for 1x running, 1x throwing and 1x jumping event. Everyone does 3 events, except those selected for relay, who do that as a fourth. People usually get their preferences.
Does the rest of the year-group or school watch to cheer on their classmates, even if they're not taking part?
Yes - ish. Or they just meander round in packs
If there a lot of standing-around watching, does that result in behaviour issues?
Not that I've seen. As nearly all the staff are there, there are plenty of people ready to keep high spirits in check