PHOENIX -- Zoo Lights opened its gates a few days early, starting Monday night with extended hours.This is the Phoenix Zoo's 23rd year of putting on their highly attended holiday special."This year we have 3.8 million lights, 700 lighted displays, which is a big difference from 23 years ago," Linda Hardwick of Phoenix Zoo said.In their first year of the event they received 50,000 total visitors. Now, Zoo Lights attracts over 300,000 visitors in a six to seven week span.This year's theme for the annual event is "Let It Glow", based off the popular Disney movie Frozen.The zoo will also be featuring plenty of new attractions including Tortuga, the Talking Galapagos Tortoise, Polar Express in the Zoo's new 4-D theater, ice sculptor presentations, and more."This year we have two new music and motion shows which is in and around the lake so the lights are synchronized to Carol of the Bells and the Polar Express," Hardwick said.The event is for all ages and on Friday and Saturday evenings, they also serve alcoholic beverages.The event runs from Nov. 24 to Jan. 11 nightly from 5:30 p.m. to 10:30 p.m. Ticket prices range from $10 to $18.For more information visit www.phoenixzoo.org.