I definitely think you should go to an open day if it is at all possible, or else you won't be certain that the university is the right one for you. I went to an open day in January, the first two hours of the journey were spent driving down the motorway in blizzard conditions, the next four hours of the journey were spent driving in torrential rain. The trip had to include an overnight stay. But I'm so glad I went.
Of course, if you're in a different country, things are made even more tricky!
But, in my opinion - Brighton.