This week, Northwestern University in Evanston, Illinois, offers a range of engaging activities. On April 23, the Northwestern University Chamber Orchestra will perform works including Arnold Bax’s “Dance in the Sunlight” and Beethoven’s Symphony No. 2 at 7:30 p.m. in Pick-Staiger Concert Hall. On April 24, celebrate Arbor Day by participating in a tree planting event at 10 a.m. and noon, starting at The Rock outside University Hall. That same day, renowned physicist Sean Carroll from Johns Hopkins University will deliver the Heilborn Lecture on quantum mechanics at 4 p.m. in Ryan Auditorium. The following day, April 25, the Native American and Indigenous Student Alliance will host its 5th annual Spring Pow Wow at 11 a.m. in Welsh-Ryan Arena, welcoming everyone to join in the festivities. Finally, on April 27, a Buffett Conversation about violence and politics in Mexico will take place at 12:30 p.m. in the reading room, featuring a panel of experts. The week concludes with a free baseball game against Milwaukee on April 28 at 3:30 p.m. at Miller Park.