Sit on a balloon
Doing the basics:
Go big
Keep it mobile
Interactive
Have options
Read your audience - do not make them feel trapped
Location, location, location
Start strong, end strong
Put yourself out there
Be passionate and share your passion
You want to turn a crowd into an audience
Get the audience to do something you ask such as move forward or back increases the likelihood they will stay to the end by 20%
Find your own hook or opening gambit to entice people to join you
Play with phenomenon and when someone looks at it pull them in
Give them a prop to hold and they won't leave
Mobile phone in a balloon
Wallace grid: four people seated then lean back and remove the chairs
Two cans whistling by blowing between them
Tonic with quinine and cream makes marshmallows