I felt like they did that with the most recent Bellator big card, Rory and Lima. I am almost 100% confident that Bellator had that date chosen first and those big fights on that card annouced for a while, and the UFC PPV was known that it would be around that time but was put on that date after the Bellator fights where announced.
Pretty sure on this
You are correct that Bellator set their date before UFC set 220...
Bellator set that fight. Sep 20, 2017
UFC announced 220 on Oct. 30th, 2017
That said, the UFC has events every Sat... so it's kind of a hard sell to say that they put on an event on that night just to snuff out Bellator. That seems like Bellator's miscalculation than the UFC snuffing them.
I Guess you could say that the UFC made a point to put a PPV on during that same night... rather than a regular fight night, but I'm not sure this is hard evidence of that. (though maybe they just wanted to f*ck with Rory
)
In my example... I was talking about Strikeforce putting on a Wed. card & UFC would rock up & do an event that same Wed. Bellator has most of their events on Friday... but we don't see UFC snuffing them with Friday events.
Next Sat. Bellator is April 28th... which lands right between UFC 223 & 224. That's the smart thing to do for Bellator if they want to fight on a Sat.