I know that knights are deemed ready by their masters, but when/how do Masters get made?

I liked how it was in GJO where the Council would decide when one was ready and have a test of sorts, and do it like a surprise to the RPer, but this is obviously an old and out of date model. How should we do it now?

It isn't that I think we have a bunch of people who need to be made Jedi Masters, but I think Serena has earned it and I'd like her to somehow get there, sometime after she goes after Sol and heals him.