- Plenty of free water
- Plenty of food, preferably free
- Plenty of seating space
- Plenty of bathrooms
- Clear indications as to where all of those things are placed
I'll attend almost any event if I can sit down with a drink, some food and make small talk with people and maybe even network! And even if your presentation is empty and boring (as most of them are) I will still remember your event as a decent one because I was able to enjoy it my way and get something out of it.