With the Mothership’s sights set on the Imagined Order’s secret base at Corny Complex, Slone has hatched a plan to end the Invasion once and for all. You’ve answered her calls, worked as an undercover agent for the IO - now it’s time to infiltrate The Last Reality and put a stop to the Alien’s occupation. 

It’s time to commence: Operation: Sky Fire.

Operation: Sky Fire -- Fortnite’s Chapter 2 Season 7 ending event -- takes place at 4 PM ET on September 12. Join a strike team and sneak aboard the Mothership to deliver IO’s final message to the invading Aliens. 

The Operation: Sky Fire event playlist will be available 30 minutes prior to start for players to jump in and reserve their spot in the mission. Be sure to log in early and standby for go time. You can join the event with a full lobby of 16 friends, so bring the whole squad and more to help you tackle Slone’s secret mission.

For content creators and players looking to relive the moments of Operation: Sky Fire - note that replays for the event will not be available. Please take appropriate steps to record and archive your experience to share with everyone.

And be sure to wear a suitable disguise - invading an alien spaceship should be done in style.

(All this was from Fortnites official website)