Playgroup - yes or no?

At 20 months, Caden can communicate very well. Sometimes, I feel that his vocab is as good as his gor-gor. He can tell us whatever he wants and can even reply to us when we ask him questions.

Each time we send jie-jie & gor-gor to school in the morning, Caden would insist on going in to join the kids. This makes Daddy prompt Mummy to send him to playgroup in Jan next year, so that he can pick up social skills as well. Mummy's considering hard now. Is it too early?