It is every year but only during the month of August.

The view will be great wherever you are. But the stands are very high...so the closer/lower down you are...the less steps you have to climb. Aim to be as far away from the castle as you can for the best view because when the performers come out of the castle, they tend to face straight forward for alot of it. Hope that makes sense.

No they are not allowed but you can buy a raincover like a poncho for approx £1

Yes. There seem to be no restrictions enforced with regards to filming.

Yes mine was left with the stewards under the stand.

Yes as with wheelchairs they are kept in a safe area under the stand where your sitting

The ticket conditions say that no commercial photography is allowed. From a practical point of view it is impossible for anyone to leave their seat without getting the whole row to stand up. Most of my best clips were ruined for this reason because people were continually coming and going.

Hello no there isn't it's straight through

I took my knee pad to sit on. It’s light to carry and not bulky. Otherwise a small cushion would do. They use to hire out cushions but I didn’t see this this time.

It can be quite a walk from the nearest parking as cars are not allowed up the hill. For disabled attendees you are best placed booking accessible tickets, which will allow you to join a convoy for the purposes of drop-off. There is however no parking in the castle. Alternatively, there is a church near the entrance to the castle where you can arrange for volunteers to push you up in a wheelchair. You can then get up the hill via one of the bus services or a taxi (before they close the hill).