Hi Chikako, 

Each memeber is allowed up to two passes.  If there are any left overs, we can send you a third. But, it's usually just easier to have those people request their own. Here's the link to provide us with your info:

http://www.renderosity.com/mod/survey/index.php?Ques=15

Yes, Renderosity will be at booth #950.  Please stop by to say Hello and get some freebies. 

Best Regards, 
Jenifer