Hi Mark,
You will need to keep the front sprocket cover on, not just for TBEC but for any ACU event, but you can remove the rear chain guard.
Also make sure you have yellow backings on side and front panels and black numbers.
It would be a good idea to remove the indicators (less to break) and the number plate if it's a road type one.
Hand guards are useful, but if not fitted, make sure the ends of the grips aren't ripped or cut, as the handlebar ends need be covered. The levers mustn't be broken or filed flat, they need ball ends.
Also check the wheel, swinging arm and headrace bearings aren't knocking.
If your bike has an aftermarket pipe, check it's not too loud.
I hope this all helps!
Fiona