Additional Reception Ticket on SIGCHI

Hello all IXDers!

Can anybody tell me what rights give the "Additional Reception Ticket" which
I can buy with my CHI-2008 registration procedure? What is the purpose of
this ticket?
I cannot find any words about this one on the official site (
http://chi2008.org/)

Regards, Alexey Kopylov
http://uidesign.ru
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