Hi Baz,
For the drag racing both the indoor and outdoor racing will have 3 qualifying runs. They will be drawn at random so you will be against a different dragster each time.
Your worst time will be dropped and the average of your best 2 runs are used to determine your position. The top 4 Dragsters of each catagory go through to a 3rd and 4th play-off and the 1st and 2nd place finals.

Hope that makes sense!

Also, i'm not sure if your planning on comming on the Saturday - but the Indoor qualifying thats been put on saturday afternoon is for anyone thats there on the saturday. If your only comming Sunday it wont affect you at all.
This is only done because the schedual is so tight and with 40-50 dragsters expected to turn up it is almost impossible to get through all the qualifying runs on the sunday.