Bettyboop66- Occasionally a street vendor will appear in the central pavillion of TamaEXPO. This event will be announced on the Tama News Board (it'll say "The --- shop is open!") If the event is announced and yet you cannot see the street vendor (it should appear around the Ecology Pavilion somewhere) then enter another building and then come out and you should see it.
Chrism44- No, you cannot connect with other Tamagotchi owners from around the world. You can do surveys but that's about it. I don't think TamaEXPO has any items on there for bonding. You can bond the family by playing Golf Putt or Shoe Match (games unlocked on the second generation or higher), playing communication games, training or using some of the special bonding items a LOT of times.