I did latin at AS level (god only knows why!) and am a bit rusty but i think "I had..." is the pluperfect tense so the ending would be eram - so probably something like conventiculeram which is a sort of assembly or congressueram which is more of a friendly meeting.
But a big health warning - i would have these checked as you might just want the past tense not the pluperfect (veni vidi are past tense) and also it depends on whether the people going to conference are likely to understand it/be very picky about it being the right endings!
Convoco is to call together or convene, so "Veni, Vidi, Convocti" might do it - "I came I saw I convened"
or Veni Vedi Dicti - I came, I saw, I spoke
or Disputi - I discussed
If I've conjugated the verbs properly of course. Maybe you should pop in to your nearest RC church and find an old rebellious priest who insists on still using Latin . . . or put a call in to Dulwich College, I bet they still teach it there... Or pop in to the Crown Court at lunchtime and ask a judge!
Bringing back memories of my dodgiest academic moment, Grade 6 (just passed) O Level Latin circa 1974, so it's a miracle (and slightly alarming) that anything is there to recall!
Just to be very boring - if it was "I had met", that would be pluperfect, but if the phrase is to "have a meeting", then I "had a meeting" surely is simple perfect, the same as Veni or Vidi, so you just need the ordinary past tense. Sorry, back in my pedant box now...
Edited 2 times. Last edit at 19 April 2005 1.17pm by markandjoan.