Yes Champagne bar is open to virgin people
Concerning the quality of the drink, it's a middle-rank champagne (rating according French standard, so it could be a good one over the Channel
) It was Mumm Cordon Rouge for people who know this producer. (it's not really a producer but it's a detail when you're drunk !!!)
And you drink it in plastic flutes...
The meeting is at 9PM so don't come before 10.30 if you want to meet anyone interesting...
PS: Beware some will offer you some drink akas champagne out of rolling plastic boxes full of ice !