Ok chaps need to give a brief on Tz.. little late for travelers as they would be here by now.
I've lived here for almost 5 years in Dar so can share some info.
Firstly Bolasie means nothing to the locals. They are more excited to see Rooney and quality players. Bolasie is not Tanzanian or even East African. It's like the French wanting to go see a German.. silly. Assuming being black means universal support from an African country is a little condescending really.
Secondly you definitely can catch something. Malaria is quite bad at the moment owing to extended rains. Lube up the repellant. Worst outbreak since we've been here.
Risk of violence. Virtually zero. Politically stable for years and the new president has banned opposition parties from rallies so it's all very quiet. The only crimes that happen often are drive by bag snatches. So best not to carry handbags or shoulder bags road side.
Lastly they LOVE the EPL here. So why Africa or Tanzania, why not? You see shirts everywhere of different clubs, including Everton! They wear shirts of clubs they don't support just because they love the game.
Great pubs to get a pint before the game. Enjoy if you visiting!