The antonyms for the term "day gigs" could include a variety of phrases such as "night work," "weekend job," "evening shift," "graveyard shift," "part-time work," or "freelance projects." These are all different forms of work that would take place during different hours of the day or week as opposed to a regular daytime job. Night work could refer to jobs such as bartending or security work that take place in the evening, while freelance projects could include work that can be done on your own schedule. Ultimately, the antonyms for the term "day gigs" would refer to different types of work undertaken outside of a regular daytime work schedule.