Home Travel Events 2021 December SITE Chicago: Annual Holly Trolley 2021 SITE Chicago: 7th Annual Holly Trolley to be held this year on 16 December 2021. Details Date:Thursday, 16 December 2021 Website:https://siteglobal.com/event/site-chicago-7th-annual-holly-trolley Venue 3 Locations Downtown Chicago, Chicago, United States