The Lawrence Parks and Recreation department will offer a Spook ‘N’ Splash, Saturday at the Indoor Aquatic Center, 4706 Overland Drive.

From noon to 12:45 p.m., children will be able to make crafts and show off their costumes before changing and taking a dip in the pool. The event costs $7.

“We feel it’s important to have positive programming so people don’t get into mischief,” said Roger Steinbrock, the city’s parks and recreation marketing supervisor. “We just want to make sure there are no tricks, and they’ll have plenty of treats.”

In addition, the city has organized a Trick-or-Treat Trail Hike from 1 p.m. to 4 p.m. Sunday at Prairie Park Nature Center, 2730 Harper St., around Mary’s Lake. The hike is Robin Hood themed, with costumed characters throughout the hike. After the hike, cider and cookies will be served. The event costs $3.

Downtown merchants will hand out candy from 5 p.m. to 7 p.m. Wednesday. And the city has set trick-or-treating hours in residential neighborhoods from 6:30 p.m. to 8:30 p.m. Wednesday. Residents are asked to turn on their porch light if they want to participate.