Hare Krishna dear all,
Please accept my humble obeisances. All glories to Srila Prabhupada.
All three sound great - can't go wrong with any of them.
However, (A) is indicative of what is to be expected at the event. It has enough "catch" phrases - yoga, kirtan, philosophy. The "lore" part will easily allow the speaker to present examples from SB/BG/CC. Highly likely you will not see people land up with yoga mats :-). So my vote goes for A.
Your servant,
Ganga Narayan das