I noticed that in Matt's shots there are pieces of Yellow and Red tape laid out in a line at the steps of San Francisco Church, just inside the gate.
I suspect this is where teams must wait/sleep until morning.
Opps, not San Francisco Church, Thanks Boingo, (I was just being sloppy): Igreja Do Santissimo Sacramento Do Passo
Not to mention that you already saw it. But I didn't know what you were talking about
Lots of red and yellow on that staircase on the 23rd of April. Task for our racers?