The antonyms for the phrase "threw party" can be varied and numerous, depending on how one wants to approach the concept. Some possible opposites could include "cancelled party," "ignored party," "avoided party," "skipped party," or "postponed party." All of these antonyms imply a lack of interest or engagement in the act of hosting a gathering, whether due to personal reasons or external factors. Other antonyms could be more positive or neutral, such as "attended party," "co-hosted party," or "sponsored party," which suggest a collaboration or participation in the event rather than its organization. Ultimately, the choice of antonyms depends on the context and intent of the communication.