The two shows, along with the addition of classic rock band Kansas, were announced Monday in a news release.
Menzel -- the voice behind Elsa in Disney's animated film Frozen and the hit song "Let It Go" -- is scheduled for 8 p.m. April 5. The "Wicked" star previously headlined Sands in July 2015. (Menzel starred as Elpheba, a.k.a. "The Wicked Witch of the West," in the original Broadway production of the popular musical.) Tickets cost $69-$99.
Kansas has been penciled in for 8 p.m. May 27. The group's hits include "Dust in the Wind" and "Carry on Wayward Son" and. Kansas released their 15th studio album, The Prelude Implicit, in September. Tickets cost $39.50-$59.50.
On Aug. 21, Iglesias will bring his "Fluffymania - 20 Years of Comedy" tour to Bethlehem. The performance will mark Iglesias's fourth trip to Sands. Iglesias previously headlined the venue in 2012, 2014 and September 2016. Tickets cost $65 and $45; Gold Circle seating tickets cost $75.