5 Proposed Design Concepts To Be Revealed During Arnold Arboretum Entrance Improvement Meeting on Jan. 21 By David Ertischek on January 19, 2023 5 Proposed Design Concepts To Be Revealed During Arnold Arboretum Entrance Improvement Meeting on Jan. 21 The Arnold Arboretum will display five proposed concepts for its entrance improvement project at a Jan. 21 meeting.