A club can only be popular if the subject is popular.
For example, the Harry Potter spot (on which this totally unrelated question is) is on the subject of Harry Potter, which is already popular outside of fanpop.
Do NOT beg people to join. Just wait patiently, subtley tell your friends, make the spot as interesting as you can, and watch the fans come.
1. Discreetly tell people about it (for example picks "Will you please join my spot!!1!" wouldn't fall in this category, links to spot and wall posts maybe would).
2. Icon and banner can make your spot beautiful. :)
3. Add content to your spot .
