Return To Boletaria is an event to encourage players to play Demon’s Souls, and it is going on right now. It runs until December 7th. You can learn more on the official Reddit thread, including directions for using a private server so that you can access multiplayer.
I would so love a Demon’s souls remaster. My ps3 is on its last legs and it really fucks up how DeS runs for me, but there’s no way I’m dropping cash to pick up a new one. It’s such a good goddamn game, but it suffers more than any other souls game from not having a multiplayer community. A remaster would be great.