Can you go to the symphony as just friends?

I spoke with D2 just now. It's so funny that he actually waited the 3 days to call me back. I know that on Fri, I told him that the rules don't apply. But, he wasn't really listening, which I've been learning is his problem. He got around to asking if I was free on the weekend. I responded by making it absolutely clear that there is no romantic future possibility between us. He's cool, we can be friends, and that is it. I said this, like 5 times! Really. He said, that's fine and asked if it would be alright to do certain things he likes to do-but is more enjoyable with a girl-like the symphony. I suggested that he could be included into my group of friends, but he rejected the idea. I said, yeah, look a little inward; you should work on that.