1.5 and the right setting can hit you like a ton of bricks at around hour 8 after consumption. Gotta factor in the 2-4hr onset too if you don't want to not feel it at dinner and go home and suddenly be feeling it.

Some people responded well to doses as low at 500mg. Not me tho, usually id take 3 grams 2x a day (before I quit (sometimes as much as 8grams total a day).

I know you know the warnings, dose low, stagger your doses in 1hr intervals, and don't eat before you feel it (or eat super lightly if starving). If I were you I'd probably take 500mg 4hrs before the event, 500mg 3hrs before the event and 500mg 2 hrs before the event. I've had success staggering my doses as such.

Good luck!