at which conference was the 27 point declaration adopted

Unfortunately, without more context, it’s difficult to pinpoint the exact conference where the 27 point declaration was adopted.

There are two main possibilities:

A Specific Organization’s Declaration: Many organizations hold conferences and issue declarations outlining their goals or positions. The “27 point declaration” could be specific to a particular organization and its conference. For instance, the Non-Aligned Movement (NAM) issues declarations at their summits. Their declarations often have titles, but they might also be referred to by the number of points [e.g., Havana Declaration (1979)].

A Lesser Known Declaration: There’s a chance the “27 point declaration” is a lesser-known document not associated with a major international organization.