There are no recommendations provided on when to buy or sell a particular smallcase. It's upto each investor to decide which theme will work and when to buy or sell. As a concept, smallcases work best when used for long-term investing. 

Sometimes markets over/under-react to events in the short term which should auto-correct with time. You might make more profit by selling before an event or after. 

However, should the theme of a smallcase you hold completely play out, you would be notified in this case.