On this page of the game guide to Borderlands 2 you will find a detailed description of the side mission titled Clan War: Wakey Wakey. You can begin this quest in The Dust after the completion of the side mission named Clan War: Trailer Trashing.
2) Ellie's workshop
3) The Holy Spirits
Speak with Jimbo at the Hodunk camp  and accept the mission. Head to Ellie's workshop  and use Fast Travel  to get to Sanctuary. Go to Moxxi's and order three Lagers.
Properly drunk, once again use Fast Travel to move to The Highlands Overlook and head inside The Holy Spirits . Inside, take a good position (for example on a balcony) and get rid of all the guests. Return to Ellie's workshop  to end the mission.