No, we wouldn't. I DO have a real and healthy mother/daughter relationship and if Mom showed up at my "home" (it's not your home) or at my concert or whatever and I didn't expect her, I'd just be happy to see her, say hi, and get back to work because that was my job. It wouldn't be upsetting. I'd welcome her and tell her I hope she enjoys the concert. Good relationships don't get bent out of shape over unexpected meetings. More likely, we're just happy to run into each other and move on.