Validating multiple fields problem

So, I have an event model that you are able to assign people to. Some events require at least 2 people to be assigned before they are considered valid. I have two fields for the user to filling in the persons name, and a custom validation rule that accesses $this->Event->data to loop through the different fields. This works great the first time through as the data is there, but it then fails a 2nd time (still within the same validation call) because $this->Event->data is now empty.  So here are my questions:

• Is there a better way to get the data from the other fields in the Event form? 
• Why is $this->Event->data being cleared midway through the validation rule? 
• Why does the custom validation function get run twice, failing the 2nd time?
• Is there some flag I need to set to make the validation only run once?
• Can I access Session data from within my model?

Thanks.

~Michael

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