It's just to minimise the possibility of incidents. In a way, it'll fun for them to have the whole pub to party in all day. I'm sure one or two will venture off piste to try out a few other pubs. There's bound to be a few around in the days either side of the match too.
I won't be there but I finish work at 3pm Thursday and i'm not working Friday so I'll be sure to create a decent atmosphere at my house. Might buy a clacker.