The biggest spike of searchers for Elon Musk occurred between April 23rd and April 29th. Over the course of these 3 days, 3 major events occurred that caused this massive spike. First off, on April 24th in Vancouver, Canada Elon Musk had a Ted conversation with Chris Anderson about the future that Musk is creating for humanity. This caused a massive increase in searches for the visionary billionaire.
Second, on April 26th Elon Musk announced that Tesla Motors will reveal their new all electric semi-truck in October. Elon tweeted that the new truck is a "beast" and he expressed during his Ted converstaion that the truck will be also equiped with Tesla's signature autopilot feature. He concluded that this truck would change the trucking industry and further progess the company's goal of reaching a full fleet of electric vehicles.
Finally, on April 27th Elon Musk's giant tunnel boring machine arrived at Space X. This is the first major development in Musk's newest venture - boring! He plans to create a massive network of underground tunnels to solve the chronic traffic of Los Angeles. Musk plans to bore a series of test tunnels underneath the Space X campus as a proof of concept.