Being a guest at a particular event or place indicates acceptance and hospitality. However, there are situations where being a guest is not desirable. Synonyms for 'be a guest at' include participate, attend, and visit. Antonyms for 'be a guest at' include host, organize, manage and run. Therefore, instead of being a guest, you can take charge and organize events, give directions or lead meetings. Being a guest is essentially a spectator, and by actively participating, you become the driver of the event or situation. In conclusion, there are various antonyms for the phrase 'be a guest at,' but they all reveal an alternative perspective that can help you become more active and less passive.