If you're a customer of a TechEd sponsor or exhibitor, ask your sales rep if they are having any customer receptions or parties during TechEd. Or stop by the booth and ask. The worst thing they can say is no.
If you work with Exchange or Lync, Jeff Guillet coordinates a UC Roundtable event which gives you a chance to chat with people from the product teams and your peers (and usually have some food and drinks too). That will show up on the calendar that Shane referenced.