The thing is Les, would you recommend to someone that you don't know (or even a someone that you do) that they should go to a 'folk club'?
There's such a diversity of types and quality of musicianship, not to mention the chances of feeling that you're intruding in some private members club, that to give a blanket suggestion is quite likely to end in disappointment if taken up.
Even making specific suggestions is difficult if you don't know the tastes of the person to whom you are giving advice.
As an anonymous non-famous individual I would think thrice before suggesting to a friend that they went to a folk club. 'Famous folk' with reputations to uphold may not wish to give out blanket recommendations to strangers to do anything that they have little knowledge of (i.e. the folk clubs in a local area).