I've looked all over for this fic, its willows will be done spell. Before willow can end the spell spike and buffy run away to vegas i think to get married and the scooby gang are searching for them as willow needs them in front of her to break the spell any ideas.
I think they also go to see angel before hand and he tries to stop them as well

Is that the one where Giles is living (and possibly spike too) with Joyce and Buffy while Xander is off searching for Willow? They get tired of waiting and take off leaving just a note... And something about accidentally invoking a charm necklace during the wedding night?...
I think that's called strange bedfellows by spikesbint

No that's not it. I think angel uses magic to seal Buffy in the basement where he lives but spike or Buffy over powers him and seals him instead I think they went to angels because spike needed something from his safe 🤔

I know I've read this one! Did they go there for the ring of amara? I think there was something important about rings in this story

Im glad someone recognizes it i thought i was going mad and im not sure but collecting some form of ring does sound right

Is it Till Death Do Us Part by HCB?

Nope thats not it. But great fic.