My girlfriend will probably travel with us too (although I don't think she will join any tournament), I apologize for forgetting to mention this (I'm just mentioning it in case of problems with space in the venue).
Also, does the venue have showers?
Firstly, it's not a problem to bring your girlfriend as long as you say so, since she's also a person and we can't override the current limit. Just say that she will come in time (as you ofc did now, since it's many months to go) and it won't be a problem
And also, she will still need to pay entrance, and if she decides to actually join a tourney she can pay for that whenever she wants to before it starts.
And no, the venue does not have showers. We are currently looking for someplace close where we can hopefully get to borrow the showers for a set price. I can't say for certain yet but count on showers being available this time!