You could try "shaping" the dogs' behaviour. For this, you need to bring with you a packet of hot dogs cut up small.

When the dogs swarm around you, ignore them until one of the dogs stops hassling you for a moment. Throw it a bit of hot dog. When it stops again, throw it another bit. When any of the others stops, throw it a bit of hot dog.

This way you're reinforcing silence and good behavior.

Karen Pryor (read her book Don't Shoot the Dog, about behavioural science and animal (and human) training) can go into a dog shelter full of barking dogs and have the whole place silent in 15 minutes using this method.

As for the owners, you can do the same: ignore them until they show any sign of politeness, then give a big smile, and so on.