The moment I activated this plugin because I have DEBUG turned on, I immediately get compatibility warnings:
Strict Standards: Declaration of BP_Group_Calendar_Extension::display() should be compatible with BP_Group_Extension::display($group_id = NULL)
Notice: The called constructor method for WP_Widget is deprecated since version 4.3.0! Use
Both of these issues are simple fixes but I would rather not modify the plugin, was wondering when you might have plans for a patch?