Tesla's recent "Model 3 Sellathon" event at its Fremont facilities over the weekend of September 8th to 9th could be a warning sign about how over-bloated Model 3 inventories are. Why would one need a "sellathon" if there's a 420,000-unit order backlog for the Model 3? Customers waiting for their pre-configured Model 3s are even getting emails from Tesla, enticing them with free super-charging deals if they accept a differently designed rear-wheel drive Model 3 before September-end (example here). And then there's Elon Musk's tweet on Saturday (below) telling people to hurry and refer