By John Morgan, MMA Underground Pay-per-view event takes place Oct. 22 at Etihad Arena in Abu Dhabi. View the original article to see embedded media. The UFC’s vacant lightweight title will be up for grabs on Oct. 22 in Abu Dhabi. Promotion officials announced during Saturday’s UFC on ABC 3 broadcast that former champ Charles Oliveira and current No. 4-ranked contender Islam Makhachev will compete for the belt at UFC 280, which takes place on that date at Etihad Arena. The booking was revealed immediately after UFC broadcaster Megan Olivi revealed Oliveira had been awarded this year’s ESPY Awa…