User blog:Lukesams/About July 7th...

The Fulton Critic has stated that Cartoon Network will be airing a new show, "Summer Camp Island" in a marathon lasting from 6 a.m. on July 7th until 6 a.m. on July 9th. That marathon will be simulcast on BOTH Boomerang and Cartoon Network. Could this mean Toonami would get pre-empted for the first time since June 2007? We don't know.

Source: http://www.thefutoncritic.com/news/2018/06/11/pack-your-bags-summer-camp-island-begins-july-7-on-cartoon-network-108313/20180611cartoon01

UPDATE: CN Schedule Archive said on Twitter that a few Toonami runners have confirmed that Adult Swim will air as normal on July 7th and 8th, and Toonami will air as normal on July 7th. NO "Summer Camp" takeover there. This will imply that once Cartoon Network ends for the day at 8pm, the non-stop marathon will move over to Boomerang until CN comes back at 6 am.