If you want to write, write and draw, if you have a certain level, find a folk calligrapher's club to join and discuss with your colleagues inside. If the level is almost the same, you can go to the community activity station to do it.
If you want to paint or write on the spot, it is a little difficult to see what you want. If it's not good, you'd better go to the folk calligraphers' club and chat with the people inside. If you hit it off, maybe you can get one.
If you want a higher-grade real-life work, forget it. Some people sell paintings and some people sell words, but generally they don't paint on the spot, because writing and painting doesn't mean you can come anytime and anywhere. You must have inspiration and interest to have good works. You disdain to say that even if you let him draw it himself, what he draws himself is not easy to draw. Maybe you don't care, but people have to be responsible for their own work, don't they?
A calligrapher I know hardly writes in front of strangers. Of course, he also writes in public, but most of them are also public occasions for their calligraphers' gatherings.