When they invited me on the two day 460 km trip to/from Wuzhishan it made me feel ever so good that they thought I was good enough to go on it, even if I ended up on a bus for about 60 of day one's kilometers, and all of day two's kilometers.
When they invited me on the one day 310 km trip to Sanya it was nice to be invited even if I was busy that weekend and had no way of going.
I can't go. There is no way I can go. My time is already bespoken and even if I haven't bought the tickets I already know which flight I'm taking to the US halfway through week one of a six week trip to Tibet. But they thought I was good enough and serious enough to invite me.