Sorry I'm late guys...
A walk around that I've used and gotten a good repsonse to is to take about a dozen balloons and fill only 3 or 4 with helium, the rest with plain air and tie strings to all of them. Then I hold the non-helium balloons by where they are tied off at and let the helium balloons float above the rest.
When I meet a child I offer them a helium balloon. If an older sibling asks for one, or sometimes I'll offer one to Mommy or Daddy, I give them a non-helium balloon, making sure to hold by where it is tied off while they grab the string. Once they have the string I let go of the balloon and it flops to the down.
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