The US rapper will top the bill on Friday, with Biffy Clyro the headline act on Saturday, and Snow Patrol on Sunday.
Orbex is halting construction work on the £20 million spaceport which received a £14.6 milllion public investment package.
It comes ahead of a yellow weather warning for wind for the Western Isles, Orkney and Shetland and part of the Highlands and Argyll and Bute.
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