From their post on OpenNTF.org:
OpenNTF will be participating in the Lotusphere 2012 Product Showcase at pedestal number 516 and look forward to having you stop by! Members of the OpenNTF community will be hand to discuss all things OpenNTF. We have some really great OpenNTF stickers to give out as well.
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If you are looking for me (and who isn’t), you can find me there on Monday from 10AM-12:30PM and 6PM-8PM, on Tuesday from 9:30AM-12:30PM, and on Wednesday from 12:30PM-3:30PM. Here’s a picture of the layout with the OpenNTF booth highlighted: