Op updated, If I have missed something that should/could be listed here let me know and I will add it.
It is a qualifying event for the Race of Champions. All division winners are automatically entered (you are one) and then winners of community events are invited to fill the grid. Those that have qualified this way will be put through an elimination procedure to determine who gets a start. This event is run by @t_b_williams
There is only 16 entries I think so no qualifier required.... and if there is a qualifier required...incey the prelude is only a practice event