Changes participation in a plan

        :param plan: Plan to take part in or not
        :param take_part: Whether to take part in the plan
        :raises: FBchatException if request failed

def changePlanParticipation(self, plan, take_part=True):
        """
        Changes participation in a plan

        :param plan: Plan to take part in or not
        :param take_part: Whether to take part in the plan
        :raises: FBchatException if request failed
        """
        data = {
            "event_reminder_id": plan.uid,
            "guest_state": "GOING" if take_part else "DECLINED",
            "acontext": ACONTEXT,
        }
        j = self._post(
            self.req_url.PLAN_PARTICIPATION, data, fix_request=True, as_json=True
        )