I've been invited to...

Just checked my NUS email.
Noticed that I received an email regarding the Main Commencement Ceremony.
And on further reading of the email it says:

3. Congratulations! You have been selected by your Faculty (subject to the conferment of your degree by 30 June 2008) to be part of the privileged portion of the 2008 graduating cohort to be presented at C1 in lieu of the ceremony scheduled for your home faculty. C1 is scheduled for 7 July 2008 (Monday) at 11.00 am.

Wow!
I did not expect myself to be selected for the main ceremony.
I had read briefly before about this main ceremony where only selected graduates get to attend.
Little did I expect myself to receive the invitation too.

Now, I have to think about it.
Either
1. receive the scroll during the main ceremony from the Chancellor of NUS and sit in as an audience for my Maths dept session (faculty ceremony)
or
2. decline the invitation to main ceremony and receive scroll together with my coursemates from the Science Dean (or someone from the Science Faculty).

Which one should I go to???
Anyone can tell me?