Going to Blizzcon, here's some tips on etiquette there (RP btw).

Meeting other races
Upon meeting a gnome do not assume they would like to be punted across the convention center like a football. Ask them politely, than punt them across the convention center.

Though you may want to be helpful, it is encouraged that you do not bring up the names and numbers of any orthodontist you know to any orc or troll. The protruding fangs are what make them unique.

Night elves are discouraged from dancing. Young children will be attending the convention.

It is impolite to jump upon a tauren’s back and attempt to hold on for 8 sec. as they try
to get you off. The accepted norm is 10 sec.

Upon meeting a blood elf or dwarf it is considered impolite to ask them if they would qualify for the reality show “Intervention.”

It is impolite to refer to any member of the Forsaken as a zombie. Zombies are undead, flesh-eating humans created by George A. Romero. The Forsaken, are undead, flesh-eating humans created by the Lich King.

It is impolite to ask the draenei if they are related to satyrs. That dubious honor belongs
to night elves.

Humans will outnumber all other races at the convention. Only interact with the ones with golden question marks over their heads to go up a level or earn money.

Meeting a Blizz employee
It is impolite to bribe a GM with 20 dollars to take you to GM Island. Pay whatever amount they ask to get the privilege of visiting the island.

When meeting a Dev. ask an original and creative question. For instance, instead of being the 40, 599, 600th person to ask “When you fellas gonna open the instance in SW?”, ask something like, “Why don’t tailors have a recipe to make me a new pair of underwear?”

Miscellaneous
Wait at least a day after the convention to post your swag on any Internet Auction site. That way you can see how much people are truly willing to pay for a code that makes their char. run around in a fish man suit.