Struggling with entity framework 6

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MVC

I'm having a problem getting my head wrapped around EF6.

I have the following tables:

AspNetUsers (entity provided by MVC)
ICSProfile
ICSEvent
ICSVehicle
ICSEventClass
ICSEventEntry

I want to associate them as follows:

0) A given AspNetUser can have one ICSProfile record. A given profile can have one or more ICSVehicle records.

1) A given ICSProfile can have one or more ICSEvents. An event can have one or more ICSEventClasses.

(this is where I'm a bit dodgy)

2) A given ICSProfile can enter one or more vehicles in an ICSEvent one or more times, but each entry for a given vehicle has to be in a different ICSEventClass within the ICSEvent.


So, let's say our vehicle owner's name is John, and he has a 2012 Mustang, and a 1967 Mustang. Let's also say that user Bob has created an event that has three classes:

2005-2014 Mustang
1965-1973 Mustang
Street Machine, All

John wants to enter his 2012 Mustang in the 2005-2014 Mustang class, as well as the Street Machine All class, and finally he wants to enter his other car into the 1965-73 Mustang class.

What I have tried:

So far, my entity diagram looks like this:

AspNetUser(1)<--->(1)ICSProfile(1)<--->(*)ICSVehicle(1)<--------------------------\
                   |                                                              |
                   |                                                              |
                   |                                                              |
                  (*)ICSEvent(1)<-->(*)ICSEventClass(*)<-->(*)ICSEventEntry(*)<---/

Is that right? Does it look weird? It looks like a big circle (and circles are usually bad when you're writing code).

If I didn't explain this well enough, let me know, and I'll modify the question.