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 Paul, 
I agree with Sharon Gates that the leap from 
disposable to reusable cups is where the big eco-benefit happens. 
I've used reusable rented cups for events in the 
past.  They work great!   We even encourage people to label their cups 
with masking tape and we provide an area for people to place their cups when not 
in use so that they can use them repeatedly in the same day.  (particularly 
if the event is big, you will need to have volunteers help attendees and watch 
the tables)  If the rental and washing fees are a problem, you could 
charge a small rental fee or take donations from the visitors.  If you 
explain you are doing it for the environment, and it is well organized, most 
people understand and will really learn something from it. 
Just another idea. 
best regards, 
Van Calvez 
Human Nature Solutions 
Bainbridge, WA 
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