Double credit weekends could be a tad more common imho maybe twice every 2-3 months, especially on months that are boring, seasonally speaking.
Around more special occasions Splash Damage could do their own events similar to their Containment War Event, with it maybe being a double credit event or beginning with one.
As an example, with Dockyard they could do something like a “Wreckage” event. Skins meant to look like broken twisted metal, with a reasonable drop rate and special trinkets related to the event like w mix between Containment War and What The Dickens?