Hatefest is a derogatory term used for an event or gathering that is primarily focused on expressing and inciting hatred towards a particular person or group. However, there are several other synonyms that can be used to describe such an event or gathering. It can be referred to as a rally, protest, demonstration, or even a mob. Some may call it a hate march, hate speech, or a hate parade. Additionally, it can be described as a vitriolic conference, a venomous congregation, or even a toxic congregation. In any case, such events are usually considered harmful and can exacerbate social and political tensions.