I just receive a spam (since it is commercial and unsolicited) from The New York Venture Summit starting with the following:
"Due to popular demand, we have decided to extend the opportunity for companies to submit their executive summaries as well as “Early Bird” registration until Wednesday, May 23rd. Don’t miss this opportunity!"
This is a conference, which means it has limited inventory. If it is being so successful, I'd assume that their inventory is sold out and the message would say "we are sorry, but we cannot accomodate any other company at this moment".
I'm the Co-founder & CTO of 
