According to backstage reports, WWE will be holding more RAW and SmackDown shows back-to-back at the same venue in 2018.
The report goes on to state that this is something the company has been testing out a bit in 2017 and while the results were mixed, there is great cost savings both in terms of setup and travel to have events in the same city for two nights in a row.
On the downside, attendance on the second night (SmackDown) most of the time isn’t that great, but according to sources, WWE doesn’t seem to be too concerned with having low gates these days.