We are always looking for ways to improve your event ...
From my experience of attending, organizing or MCing over 350 conferences, I’ve noticed a few perquisites that make everyone's time more beneficial:
Plenty of water easily available
Good lighting - on and off stage
Good sight-lines from audience to presenter (eg the less pillars the better)
Paper and pens ready
Room temperature optimal and humidity moderate
Healthy light lunch and snacks - not heavy food, carbs & sugar
Big name tags on participants - to encourage networking
A good venue AV system.
The right size venue for the group - not too big or too small.
Comfortable seating helps too.
Audio Visual Guidelines: I prefer to use a good quality cordless microphone rather than a lapel mic.