i can't seem to trigger the last part of the feast quest, no mattr whose tent i enter the only options are to leave or talk about the trial
In order to trigger the final part of the feast, regardless of which captain you have chosen to help you with the feast (or even if you have chosen to perform your own feast), you must have started the feast quest by choosing a captain to work with (or choosing to work alone, if you don't want to work with a captain or none of them are willing to work with you). You must also have completed the White Hind Hunt, you must have convinced Vhelis to return to the orc camp, and you must NOT be in the investigation phase of the bar groping quest line. If you have not successfully hunted the white hind or have not found Vhelis and convinced her to return, you must complete those quests. If you have started the investigation phase of the bar groping quest, you must complete the bar groping trial event before you can get trigger the feast to begin.
To trigger the feast, you must return to the captain with which you chose to work and select the "Are we ready for the Horned God's Night?" option, then choose "Yes". If you chose not to work with a captain, you will need to talk to Jadk in the Silvertusk Bar instead, and choose "Am I ready for the Horned God's Night?", then choose "Yes".
The option to ask "Are we ready for the Horned God's Night?" or "Am I ready for the Horned God's Night?" should be visible with your chosen captain or Jadk from the moment you have chosen your alliance for the feast (that is, from the moment you get a captain to agree to work with you or the moment you choose to work alone, in the case of the Jadk interaction). Failure to complete the tasks listed in the first paragraph (white hind hunted, Vhelis returned, and not being under investigation for the bar groping quest) will just cause responses from the character you are talking to telling you to complete those tasks before triggering the event.
If you cannot see one of the conversation options from the previous paragraph, you either have not chosen your alliance for the feast (in which case you should probably go back to the Silvertusk bar and see if you can talk about the feast with Jadk), you have proceeded to the Red God's Arena section of the game (and thus already finished the feast), or have bugged the game somehow.
I suppose it is possible you had obtained some very unusual set of stats during the introduction of the feast event (when you went to the Silvertusk bar after the catgirl raid and chose "Ask about the commotion") that the game hadn't planned for, which, if possible, might cause errant behavior in the quest. For example, if the affection of both Tekrok and Rokgrid were less than two, Dajrab's affection was less than one, and you had less than two points of dom, that might bug the quest introduction event, but I'm not sure if that set of stats is possible in a normal playthrough. I suppose you might also be able to cause problems in the feast quest if you chose to show Tekrok's evidence against Rokgrid during the orc raid trial, then managed to improve Rokgrid's affection for you to above two and choose to work with Rokgrid for the feast (showing the evidence during the trial bars you from visiting Rokgrid, but you need to visit him to proceed with the quest if you choose to work with him during the feast event introduction), but again, I'm not sure if this is possible in the course of a normal playthrough.