Listen to Sportsound from Easter Road
Lundstram forces in rebound after Tavernier penalty saved
Obita shown second yellow & Moriah-Welsh gets straight red three minutes later
Silva slides in late second to kill tie
Game delayed after injury to Hibs' Boyle
Rangers join Aberdeen & Celtic plus either Morton or Hearts in Monday's semi-final draw
Yesterday was a bit wild.
Aberdeen took the first semi-final place by beating Kilmarnock.
But their fine win came secondary as Neil Warnock left less than an hour after the game.
You can watch the best of the action from Pittodrie by bashing that play button below.
Just another day in Aberdeen's chaotic campaign.
Highlights: Aberdeen 3-1 Kilmarnock
BBC Radio Scotland
Fancy listening along with the Sportsound gang today? Of course you do.
The team will provide live commentary from Celtic Park and Easter Road in a bumper Sunday show.
Coverage is under way on BBC Radio Scotland.
Celtic v Livingston (14:30)
As expected, Livingston are without captain Michael Devlin after the defender was forced off last weekend against St Johnstone.
He is one of three absentees, with midfielders Jason Holt and David Carson, who is cup-tied, also not even making the bench as manager David Martindale makes five changes in all.
Veteran on-loan Hearts goalkeeper Michael McGovern is preferred to Shamal George, who is joined on the bench by Andrew Shinnie despite the midfielder's goal in Perth last weekend.
Joel Nouble returns to attack, with Jamie Brandon in defence, while Steven Bradley and Stephen Kelly are in midfield.
Image source, SNSStephen Kelly (centre) returns to Livingston's midfield
Celtic v Livingston (14:30)
Cameron Carter-Vickers, who had returned from injury to play Celtic's latest three games, is a notable absentee, with Stephen Welsh coming into the centre of defence.
The only other change is Nicolas Kühn starting on the wing in place of the suspended Yang Hyun-jun.
Fellow winger Luis Palma had been an injury doubt and does not even make the bench.
Image source, SNSGerman winger Kuhn comes into the Celtic attack
Celtic v Livingston (14:30)
Celtic: Hart, Johnston, Welsh, Scales, Taylor, Iwata, O'Riley, Bernardo, Maeda, Kuhn, Idah.
Substitutes: Bain, Lagerbielke, Furuhashi, Holm, Oh, Vata, Kelly, Forrest, Ralston.
Livingston: McGovern, Montano, Obileye, Sean Kelly, MacKay, Brandon, Bradley, Nouble, Nottingham, Stephen Kelly, Yengi.
Substitutes: George, Donnellan, Anderson, Sangare, Shinnie, Guthrie, Culbert.
Let's get to the teams...
Celtic v Livingston (14:30)
Image source, SNS
Image source, SNS
Image source, SNS
Image source, SNSOne down, three to go.
Aberdeen took the first place in Scottish Cup last four yesterday, then lost their manager about half an hour later.
Two other spots will be filled by the end of today, with Celtic hosting Livingston before Rangers go to Hibs.
Get comfy, we'll be here for a bit.