Two Aramco facilities, a power station in Dhahran al Janub, a gas facility in Khamis Mushait, and a water desalination plant in Al-Shaqeeq were targeted in the drone strikes.
Police said that "as many as 20" individuals have been injured, with the number is expected to rise after the lone gunman opened fire at the gathering.
Russia destroyed weapons storage facility in Ukraine's Ivano-Frankivsk region by Kinzhal hypersonic missiles, which is believed to be untraceable by Western air defense systems.
An event of the Space Foundation, to be held in April, was named after Yuri Gagarin earlier. But the foundation has now changed the title and removed Gagarin's name citing current world events.