Skyrim:A Night To Remember

Quick Walkthrough
# Meet Sam Guevenne and accept the drinking contest.
# Help clean up the Temple of Dibella.
# Ask about Sam and the staff in Rorikstead.
# Talk to Ysolda in Whiterun about the staff.
# Head to Morvunskar.
# Search Morvunskar for Sam and the staff.
# Receive your reward from the Daedric Lord Sanguine.

Detailed Walkthrough

Drinking Competition
Once you reach level 14, you may meet Sam Guevenne in any pub or tavern. He will challenge you to a drinking contest, offering to award you a staff if you win. Sam reaches his limit after his second drink. You can win by taking a third drink, after which a drunken Sam declares you the winner. However, before awarding the staff, Sam wants to take his new drinking buddy to "a place where the wine flows like water". At this point your mental blackout begins and the screen fades to black until the next day.

The Hangover
thumb|right|''"Wake up! That's right, it's time to wake up, you drunken blasphemer!"''
You will be woken by Senna, the priestess in the temple of Dibella in Markarth. When you ask about what happened, she states you were blathering about a wedding and a goat, or blaspheming the statuaries by fondling. You apparently made quite a mess of the temple, so she asks you to clean up the temple and make amends.

If you apologize, you will learn a little bit more information about what happened. You will have to pick up several seemingly meaningless items, namely, a giant's toe, two bottles of Alto Wine, and a confusing note from Sam. According to the note, you need these items, now marked as quest items, and a Hagraven Feather to fix the staff you were promised. You can skip the cleanup through persuasion or bribe. If you avoid cleaning up, you need not worry about trying to get the items.

After you clean up the temple, the priestess tells you that when you got there you were saying something about Rorikstead.
  

Grok and a Goat
thumb|right|Grok won't let go of Gleda ...
Head on to Rorikstead and when you arrive, look for Ennis. He will indignantly rebuke you for stealing his prized goat, named Gleda, and selling her to a giant. To get the information you need about Sam and the staff, you can pay Ennis 1000 gold for the goat, persuade him, intimidate him, or simply retrieve his goat.

To get Gleda, head south to find the goat wandering around near a giant named Grok. The giant is non-hostile, but once you get the goat to follow you, Grok will decide to attack. It is possible to steal Gleda without incurring Grok's wrath if you sneak up and "talk" to Gleda and then immediately run before Grok notices you, or yield to Grok if he does attack you. Gleda will follow you no matter how fast you run. Another option is to cast Calm on Grok before engaging with Gleda. Grok will not care that you have taken Gleda for the duration of the spell. If you are skilled enough, you can kill Grok. 

Lead the goat back to Ennis to learn that you mentioned something about paying Ysolda in Whiterun for a wedding ring.
  

The Blushing Bride
thumb|right|... and Moira won't let go of the wedding ring
Go to Whiterun and find Ysolda. She says that you bought a wedding ring on credit from her, but since there isn't going to be a wedding, she wants the ring back. Your options are much the same as earlier conversations: you can persuade or intimidate her to get the information about Sam, pay her 2000 gold for the ring, or find the ring.

If you choose to get the ring, find your "fiancée", Moira the hagraven, who awaits you at her hut in Witchmist Grove:

''"Darling! I've been waiting for you to return, to consummate our love!"

Your only option is to ask for the ring back. Moira gets mad and turns hostile:

"What? You want it for that hussy Esmerelda, with the dark feathers – don't you? I won't let her have you!"

Kill her and take the wedding ring from her inventory.

Once you have the ring, return to Whiterun and give it to Ysolda to learn where you were going to have the ceremony: Morvunskar.
 

The "Perfect" Wedding Location
thumb|left|Entering the Misty Grove
thumb|right|"You're here! I was beginning to think you might not make it."''
Having learned of the wedding's location, head over to Morvunskar. You will find a lot of hostile mages both outside and inside there. Fight your way into the fort. Eventually, after descending one, then ascending another stairway, a ball of blue light will appear. Enter the light and you will be transported to Misty Grove. Follow the path and you will find a party already in full swing, including your drinking buddy Sam. Sam will eventually reveal that he is actually the Daedric Prince of Debauchery, Sanguine. He will tell you that he was introducing some merriment and subversion into the world and was encouraging you to go out and "have fun". The items he had you bring to repair the staff, it turns out, are pointless, and will no longer be quest items. Sanguine will reward your efforts to track him down with the Sanguine Rose and will teleport you back to the pub where you met him.
 

Notes
All of the items in Sam's note are indirectly related to the quest: giant's toes are a reference to Grok, holy water is a reference to Dibella Shrine well (seems like Alto Wine bottles filled with shrine holy water), and a Hagraven feather is a reference to Moira.
It has been reported that starting this quest when you have the Markarth bounty glitch (with the guards entering a conversation loop and never allowing you to go to jail or pay the bounty) fixes it, allowing you to finally pay your bounty.
Ysolda's dialogue doesn't change even if you are already married to her. Also, if you asked her to live somewhere other than in Whiterun, you'll have to travel there to speak with her.
Senna's dialogue doesn't change even if you are already married to her. No matter where she is currently living she will still be at the temple of Dibella when you wake up.
There are a number of ways to bypass parts of the quest. Rather than getting the information from Ennis (by passing a Speech check or by bringing Gleda back), you can go straight to Ysolda. Or she can "ambush" you in front of some store in Whiterun when you are leaving the place demanding on your debt to her.
After the quest is completed, you may have a random encounter with an Argonian called Deep-In-His-Cups. He says that you and Sam owe him 10,000 gold for a bet because he ran into a bandit camp and almost died. If you say that you don't have 10,000 gold, he will attack you unless you pass an easy Speech check. If you pass the speech check, he will lower your debt to 750 coins. If you pay the debt (either 10,000 or 750 coins), he will go back to Black Marsh.
If you cannot find Sam, you can use the console command   to teleport directly to him.
Sam can spawn at any of the inns across Skyrim, including those in towns, not just the ones in hold capitals.
Based on game data, an NPC called Drunk Cultist was meant to be part of this quest, but her reference is never activated.
If you got a follower before starting this quest he/she might be in the jail in Whiterun once you've been teleported to the temple.
Teleporting to the temple will not count as "discovering" Markarth; if you have not been to Markarth before and fast travel away immediately upon exiting the temple, you will not be able to fast travel back. Instead, you may want to head to the city gates which will initiate discovering the city.
If you have already cleared Morvunskar before starting the quest, enemies will respawn in its exterior, but the fort interiors will stay empty. Loot will not respawn.
When Sanguine teleports you back to the inn after the quest, the map marker will still be pointing at Morvunskar.
Even if you never picked up Sam’s note (for instance, by using persuasion or payment at the temple of Dibella) and thus never learned about the items supposedly necessary to repair the staff, dialogue options with Sanguine will still refer to you bringing along those items.

Bugs
 
 
 You can use the console to advance the quest using the   command. You will need to resurrect the dead NPCs first (all three must be alive to start the quest). To resurrect an NPC type   into the console, followed by  ,  , and   (the refIDs are   (Senna),  1CB2B  (Ennis),   (Ysolda)).
 
 
Reload a save from before you entered.
 
 
You can skip/fix this by leaving the temple, going to Whiterun and talking to Ysolda about the ring.
You also can apologize after you kill Moira and loot her corpse.
 
This bug can be worked around by talking to Ennis in Rorikstead.
In PS4, saving immediately upon arrival to the temple and then loading the save, also fixes the problem, allowing you to talk to Senna.
 

Quest Stages