In this case, I would differ with Shakespeare and would say, "Everything is in the name!"
As soon as one reads the name "Survival Cooking Classes", one's thought goes to numerous training sessions organised by management, one forced to attend, because mandatory training hours needs to be completed, while knowing that once out of the training hall, they are never going to use it.
Cooking like any other art, is either intrinsic or it is not there in a person.
Sometimes it flares up over a period of time due to circumstances, like say in the case of cooking, a prolonged outstation stay.
But if one is told that this is "essential" survival skill, one immediately starts counting the number of restaurants nearby her/his home or office, including the "Tapris".
I believe if it is made out to be more of a fun activity , than learning a skill, more people would join.