"Drops curtain" implies that something has come to an end, perhaps a performance on stage or a presentation in a boardroom. Some antonyms for this phrase could include "begins anew," "continues forward," or "extends the show." These phrases suggest that there is more to come, that the ending is not the end. Other antonyms might include "raises curtain," "opens the floor," or "ignites the audience," all indicating a new beginning or an invigorating start to a performance or presentation. Ultimately, the antonym for "drops curtain" will depend on the context of the situation and the desired outcome.