What to wear?
Try to go with formal. If your office practise casual clothings, you can start with that on Tues.

What to bring?
PDA or notebook + pen to write important stuff down like mentioned above.

What else to do?
Be nice, talk to everybody including the cleaning lady. Stay humble.

Walk in tall and be confident. Let it feels like your presence is important so you dont feel intimidated and start sweating (I know someone like that). Smile. Relax, it will be over soon (in 8 hours) and tomorrow, it's gonna be a better day!