...No1phD...
I dunno, I really like the word Opportunity...because really life is a series of opportunities.
I think...tell her you have an opportunity to go to a concert with a friend (...friends, right?) and you are excited about going. You don't have to ask her. Be open about your plans though.
If that squelches your chance of a night of fun, so be it. After all it is early in the "relationship" (have there been exclusive boundaries set yet?) Do you want a relationship of drama? Better to find out now...eh?
(Question... Are you more concerned with hurting her or missing out on intimacy...I think you know which one makes you the D*****.)
So...moving on...this is an opportunity to find out what type of relationship this will evolve into.
Do you want one where you have to tip toe around and ask everytime you want to do something, afraid she will say NO! and create drama? (think gotcha by the short and curlys)
Or do you want a relationship where your gal knows you have other friends (...friends, right?) male and female and will have them in your life and is cool with that.
You will find out which choice will set the scene...for one or the other...Simple.
So the the opportunity is to learn something crucial (or maybe not so much) about yourself and/or the lady in question.
Personally I say you should just go to the concert. Tell her then follow through. Tell her and go. You never know...She could be just fine with it.
Another way to look at is...
What if she said the same thing to you? Would you be cool with that? Her having an opportunity to attend a concert with a male friend (...friends, right?) and is excited about going.... Hmm...Interesting....eh?
Have fun!! (I always did love Alice Cooper!)
on second thought go to the concert! Your reputation is obviously written into Mingle2 history and will go down in infamy!! Lol
What??!! 
