well that's how they promote. they may have had a flight at 203 kuai, but of course that will be immediately be booked within an hour of announcement (same in Chengdu when they started out). So nothing unusual here. Also pay attention to the booking conditions (check if date change, cancelation, name change are possible).
I can tell you for Chengdu, which usually has more cultural events than Kunming (although Kunming is catching up now). Even IF/WHEN you contact the venues (regularly) they don't sent in their stuff most of the time. It sucks, because you have to push them to promote themselves, basically begging them to make more people to know and come (and eventually gain reputation & increase business). I can assure that is a lot of annoying unsatisfying work.
But a lot of times there is no information available at all, especially events that are not primarily commercial like the one in question. Because then the venue and everyone is already paid, and they don't necessarily want a lot of people, just give face. And then you read about it the next day in the newspaper, and be like wtf how come I haven't heard about it?
Try finding a Chinese event calendar that covers all kind of events in Kunming (live rock, theatre, exhibition, dining, sport, etc.). Probably the only site that has more events listed would be douban (in Chinese), but that's about it.
You had the change to submit this event, as did anyone including the event promoters. Events, even bigger event with famous people have outside 1st tier city usually have shitty promotion, that is hardly the site's fault, but the event promoters'. Blame them.
Creating a portal that only means work and no money? Unless it's motivated by some political or religious doctrine it will not work.
As far as I remember this used to be a good place for pizza, but shidai bian le. Service is slow, pizza is ok-average, but nothing great, nor is the music, deco. Their tortellini are ridiculously expensive, and the portion so small, that they agreed not to charge for it. The fresh orange juice is the only deal I can recommend. 10 Yuan.
First it took the taxi driver quite a while to drive around as it's hidden in a side street off Beimen Jie. But the location isn't bad: 10 min walk off the lazy hang-outs on Wenlinjie (with a short cut through the east gate of Yunnan Uni). As often in China it took the staff half hour to check us in, with requesting our passports again at night and again after the check-in. Yes they have hot water, but you have to wait very long (up to 30 min at night!!!) and waste a lot of water in the meanwhile, which I specifically mention out cause they jump on the bandwagon of being green at least according to the Chinglish stickers in the bathroom. Staff wasn't very helpful when I asked them about the hot water prob, they were too lazy to get up or even reply, let alone that all the Q&A would be in Chinese, as they don't speak a word of any other language and don't bother. At first glance the rooms are clean, but next day there was a huge cockroach surfing on the wet bathroom floor. Rooms are tiny and remind you of bad days in Chungking Mansion in Hongkong. Really tiny (you can hardly move around in the half meter space between the wall and the bed), and the doubles are even smaller than the twins. All rooms have half transparent bathroom windows, which in terms of twins is a quite perverse idea. The rooms have no AC, but big flat-screen TVs, telephone and internet access. When you lift the curtains your view is limited by a fat white wall, and no it isn't the "Great" wall. The mattresses are really hard, too hard for me. I managed to break two new little shower parts just by turning it on and off, and one glass busted when filled with hot water. Also the ventilation in the bathroom doesn't really work, so in a couple of months it will be really moldy.
Other than that the hotel has no other whatsoever facilities, and no maps or other free info to help you getting around KMG. As even the lobby can only have 2 people seated at the same time it makes it really just a place for sleep, the shit/shower&shave and leave asap. I give it one star, because you feel like staying in a prison, there are better options for less money and for a bit more you get a room in real hotel like the Home Inn. Don't stay here unless every single room in Kunming is booked out and you happen to hold the Guinness world record for being the smallest person on the planet.