Update calendar area

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/3f4312f900aa475f919655d7fe367e02/

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/449b399f48874861aeada5dc6464a99c/

tower: https://tower.im/projects/8f19f0bf0e754f0b82ef2c24bc230973/todos/6b068e40b1e1434484705063c6194c87/

Change-Id: Ib2200434c1f043bcee31f3057cb3a105c22365cd