Yes you can go to the auction ANY DAY and purchase a green light car without bidding.. I just took my son (yesterday 08-31-18) friday to buy a green light car, NO auction was in session and he left out with a 2006 Chevy Impala.
Not likely as the dealers that have the cars there are usually only there on Wednesdays and Saturdays
No Wednesday night Saturday morning they have online bidding too
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