Mentor or Buddy/Stampin Pal/Sister Swaps
Very simple and a community organized event.
Time frame: to be determined but usually, a month or two, sometimes longer. 
Most stampers are required to contact each other once a week or two.
There is a coordinator who opens up this sort of swap. 
People sign up when they fill out a questionnaire then they are matched according to abilities.  New stamper swappers are matched to seasoned stampers.
Items to swap: this is a tutorial type of swap where the experienced people coach the newbies on various products or techniques.  These are often shared with their assigned stamping pal.  Mostly, it is an exchange of information or techniques which can be done by email/scans or snail mail.