I hate to come over the old fantasy fight club veteran here - but surely it depends entirely on where or when the sais event is taking place.
If it is to be held in Strikes for example then you would need people who you could actually hear talking - in such an environment a Swiss Yodeller, Brian Blessed or any person aspiring to rank at the gathering may be good choices.
If you were holding it in the Shades - those who could physically cope with the ambience - such as John the Baptist, Mother Theresa or Paul Kelly might be good choices. - or William Wallace who may just decide to "burn it !"
In the Links you would need those who could handle JAne Mitchell in all her glory - so Oliver Reed, Richard Burton, or Vlad the Impaler (for differing reasons) may be wise.
To not feel out of place in the Vine you would need pompous arrogant fools like General Haig, Henry VIII or MArcus Hacker.
Perhaps we ought to add a clause to this that you have to specify the venue and then you can cross reference this in with why you would pick the people you would.