Final answer:
An open or informal group best describes a setting with no membership conditions, attendance requirements, or expectations for abstinence. Characteristics of such groups may align with the concept of flash mobs or deindividuation.
Step-by-step explanation:
A group that does not require any conditions for membership, has no attendance requirements, and does not demand a substance of desire for abstinence can be best described as an open or informal group. This type of group provides a space where individuals can come and go as they please, without any expectations for contribution or commitment.
Such groups may exhibit characteristics similar to flash mobs, where a large group of people gather for spontaneous activities for a limited duration. Another related concept could be that of deindividuation, a psychological state of reduced self-awareness and accountability often found in large, anonymous gatherings.
However, these groups differ substantially from marginalized communities that lack representation or voice on the global stage, as the core principle of these open groups is the voluntary and non-committal participation in activities without a necessitation to abstain from substances or adhere to any specific goal or ideology.