On console's uninstalling the game and reinstalling can help with a few problem's. Clearing your cache may also work. Not sure if you can leave any DLC install's alone, as if you delete and reinstall DLC you will lose DLC equipment you have collected.
If on PC there's probably a console command that can help.
Look on your miscellaneous quests and It should say challenge sam guevennne to a drinking contest or something then add the location to your map and it should tell you where sam guevenne is. For me it pointed to whiterun tavern.
I had to hunt him down just last night, frustrating, especially since the article above is slightly wrong, and one contributor eluded to correctly. Baseline, you do not have to go into the tavern in the town where you turned, or arrived next, after turning level 15. Sam will always be in that tavern whether you went in it or not! For me that was Winterhold, I never do the side quests there because I want Thane and Hjerim. But I did turn levels 15, 16, and 17 there because of enchanting, smithing, and alchemy. This is my favorite game of all times, I've been gaming since Colleco consoles, so when things like this happen, I make note of the requirements and next playthrough, insure I do them when the programmers intended it to be done. I will have to try what Fogo mentioned, had not thought of that, thanks Fogo!
Sam (Sanguine) will appear in the tavern of the town you turned level 15 in, and he will always be there until you do his quest 'A Night To Remember' which is a main quest, for me that was the Frozen Hearth in Winterhold. About what Frogo said, I don't know how accurate that is since I don't think you can get the quest unless you've already ran into Sam in a tavern and he has talked to you indirectley or directly. I bid you good luck trying to remeber where you turned level 15. >.<
Upon reaching level 14, it is possible to encounter a man named Sam Guevenne in any random tavern in Skyrim. The first entered upon reaching that level will be where he spawns.
go to Morvunskar, Morvunskar is a ruined fort, now inhabited by hostile mages. Within the ruin is the entrance to Misty Grove, occupied by Sam and several dinner guests, just labeled "Commoners." Sam Guevenne reveals that he is actually the Daedric prince Sanguine, whose sphere is debauchery and drunken revelry. He presents you with a Daedric Artifact, the Sanguine Rose. you are then teleported back to the tavern where Sam was first encountered. Any items collected in the temple will no longer be marked as quest items.
i'm level 57 and always encounter him in Whiterun when i hit level 14/15 and now i cant find him anywhere, i cant find him in either one of Whiterun's inns or any other inn in the game and i want to get the Sanguine rose and the Wabbajack as they're the only 2 Daedric artifacts i need now
Can´t find Sam ( Sanguine ) in any Tavern and i´m level 68 ... HELP
NOW WAY, bro I had this stuggle for 2 years, I am level 92 and finally found him, all you have to do is go through random inns and you’ll eventually find him, took me so long but I finally got him. I found him in winterholds inn
If you've checked all the taverns and inns and still can't find him, enter the console command
and that will take you right to him. It kind of feels like cheating, but I searched for him for like an hour going from town to town and he ended up being somewhere I would never have thought to check. So this helps as a last resort.