MyJailbreak has a knife "eventday" (knife round(s)).
https://forums.alliedmods.net/showthread.php?t=283212
You can use these eventdays as standalone without using any other jailbreak related plugin. The eventdays can be started by an admin or by players voting (configurable). If you have an active gamemod (e.g retake) on server which should be paused while the eventday, you need to install the myjailbreak core plugin and the MyJB add-on "eventday_toggle" where you can toggle cvars, un/load plugins and block commands while eventday.
Also there are these two plugins (which I know) which will bring up a knife fight on a 1 vs 1 situation which is also popular.
https://forums.alliedmods.net/showthread.php?p=847532
https://forums.alliedmods.net/showthread.php?p=690260
don't remember which of them I used last.
on a fast github search I also found this.
https://github.com/KewaiiGamer/KnifeRound
edit: one more find
https://forums.alliedmods.net/showth...ht=Knife+Round
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