I did the bike leg of a USAT tri last summer. All of the relays had to hang their bikes on the rack and we were not allowed to ride a trainer to warm up. I met my swimmer at the bike and she gave me the chip. Had to run out of the paddock to some line where I was allowed to start riding. No drafting.
I did long intervals and a bunch of hard steady solo rides in the weeks before the tri. Eased up on Wednesday, off Thursday, Friday easy with a couple of short efforts and race Saturday. Seemed to work well for me.
+1 to getting the aero setup done early. I did a lot of tweaking of the position before the race.