How to capture attended trainings

Hi everyone,

I wanted to have some clarity on a scenario explained below:

1) If 5 employees were initially booked for an 'Business event' from 01.01.2014 - 05.01.2014. Now, 2 of them attended only on 03.01.2014 and were absent on rest days, how can I capture this on the system.

2) How can I capture and distinguish between "Employees booked for Training"and "Employees attended the training"?

3) How can I define if the training happens only for half day or for 3 hrs only on the system? 

Waiting for the reply,

Thanks,

Megha