Also, the race for eighth is insane if Port beat Carlton - which is possible given it's not only in Adelaide but will be the last game ever played at Footy Park. I get the impression the ground isn't that fondly loved, but there will still be a sense of occasion.
So if Carlton lose to Port:
Brisbane, amazingly, will be eighth if they beat Geelong (this will also happen if Carlton can only manage a draw). It's incredibly unlikely given the game's at Kardinia, but Brisbane making the finals would further embarrass the board for sacking Voss. Hope the Lions can pull off the improbable like they did in June.
If Brisbane lose, then North Melbourne will be eighth if they beat Collingwood. That's not beyond the realms of possibility. They seem to have largely broken the choking problem and can hold their own with most top eight teams. They recently beat Geelong and only narrowly lost to Hawthorn, both better teams than Collingwood. That said, the Magpies seem to be improving strongly heading into September.
If Brisbane and North both lose, then it comes down to West Coast vs Adelaide. Whichever team wins will be equal with Carlton on points. However, both currently have a weaker percentage than Carlton. The Blues are on 106.99 to Adelaide's 103.7 and West Coast's 99.25. That's not an insurmountable gap though, especially if the victor is Adelaide. So Bonnie and Vlad, one of you may end up playing finals despite the seasons your teams have had!
Carlton better lose because it's going to make these other games really exciting. If Carlton win, then West Coast vs Adelaide is a dead rubber and the other two games are only relevant in deciding exactly where Geelong finishes in the top three and whether Collingwood is fifth or sixth. The Geelong game is played before the Carlton game but the other two are afterwards. What a weekend of footy it might be!