The antonyms for the term "conventional formality" would be words that describe the opposite. These could include words such as casual, informal, spontaneous, unconventional, or relaxed. People often prefer a more informal setting where they can be themselves and not worry about adhering to strict social rules. This could manifest in a more relaxed dress code, a relaxed atmosphere, or even a more playful approach to interactions. By breaking away from the traditional, people feel more comfortable expressing themselves and engaging in conversations that might not be possible in a more formal environment. Ultimately, the opposite of a conventional formality is a more free-spirited, open approach to life.