Nothing Phone 4a will be available for purchase days before it goes on sale in the country, at an exclusive event in Bengaluru on March 7 at 6 pm IST, the London-based smartphone maker announced on Tuesday. The drop event will be held at the recently inaugurated Nothing Store, situated at 660/1, 100 Feet Road, 1st Stage, Indiranagar, Bengaluru. During the event, the f…