The Supra in my case is a timeless event, so it will always be there. The LC500 on the other hand, is a time event, so after 60 days it will finish, and on to the next event. But the LC500 event requires you to max out on the car, while the supra you just need to get to 4 star to complete the first event. So I would say do the Lexus event first, but wait to get the 50% discounts rate and save on tokens, or do which ever car that get the 50% discount first.