There are two separate entrances to the Fairgrounds Festival of Lights; drive-thru and walk-through.
For the Full Festival Experience: You can choose to do either the drive-thru or the walk around portion first. Drive-Thru Entrance is off of McKinley Parkway. Once you complete the drive-thru portion, you will be able to park your vehicle and enter through the walk-thru entrance. If you choose to do the walk around portion first, the entrance is on the south end of the Event Center (next to Hamburg Gaming), and can be accessed via South Park.
Drive-Thru Only: Drive-Thru Entrance is off of McKinley Parkway.