GIS Day is celebrated every year on the Wednesday of Geography Awareness Week (the week before Thanksgiving). It provides a forum for users of geographic information systems (GIS) technology to demonstrate real-world applications that are making a difference in our society. LA County's GIS Day 2017 event was held at Olive Court at Grand Park in Downtown Los Angeles on Wednesday, November 15th, 2017.
This is drone footage of the event. More details about LA County's GIS Day can be found here: https://egis3.lacounty.gov/eGIS/gisday/