There are no recommendations provided on when to buy or sell a particular smallcase. It's up to each investor to decide which theme will work and when to buy or sell. For smallcases, the stock selection for a theme is a result of well-documented research processes and it's ensured that the selected stocks aptly represent the particular theme.
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. You would be notified when the theme of a smallcase you hold has completely played out or factors driving a particular idea/model have changed.