Aloha Stadium on Friday will feature a concert by the Eagles, with special guest Jack Johnson, followed by Guns N’ Roses, first-timers to the islands, on Saturday.

With more than 39,000 fans expected to attend the concerts over the weekend, however, the Aloha Stadium advises concertgoers to arrive early and prepare for traffic, limited parking and long lines, and to know in advance what items are restricted from the venue.

The Honolulu Police Department will be assisting with traffic flow on surface streets around the stadium on both days. Police may conduct intermittent exit closures at the Aiea cut-off and the Halawa/Stadium exits on H-1 freeway eastbound if it begins to back up.

Parking opens at 3:30 p.m. on Friday and at 3 p.m. on Saturday, and costs $16 for cars and $31 for buses and limos. Payment is by cash only. Tailgating is not allowed for concert events. Ride-hailing companies can drop off and pick passengers up at the main Salt Lake Boulevard gate.

“Please be courteous and respectful to those seated around you and refrain from behavior that interferes with others’ ability to enjoy the event,” the Aloha Stadium said in a statement. “Remember that every attendee wants to enjoy this event, not just you. Similarly, stadium personnel strive to treat all guests in a consistent, professional and courteous manner.”

At the Eagles Concert on Friday, gates open at 5 p.m., and the show starts at 7 p.m.

Johnson, a proponent of sustainability, and his tour crew are collaborating with Plastic Free Hawaii, a program of his non-profit Kokua Hawaii Foundation, and events promoter Live Nation to roll out the r.Cup, a rentable, reusable cup program, at the stadium to reduce single-use plastic waste.

Usually, the reusable and recyclable, plastic cups are rented out for a small deposit, but all concertgoers will receive a free one with alcohol purchases, which they may take home or choose to return for reuse at future events.

Free, water refill stations will also be available throughout the venue, along with additional recycling bins.

On Saturday, the gates for the Guns N’ Roses concert open at 4:30 p.m., and the show starts at 6 p.m. for the Not in This Lifetime Tour.

Alternate parking sites will be available for $16 at Aiea Elementary School as well as at Stadium Marketplace and for $10 at Radford High School, starting at 4 p.m. Friday. The high school will offer a shuttle service for $2.

Concertgoers are also advised of the stadium’s new security measures, which includes a screening of all ticket holders, including a bag check and metal detection prior to entry at the turnstile gates. Each person is allowed only one bag no larger than 12 inches long by six inches wide by 12 inches high.

In addition, each person will only be be allowed to carry a blanket, poncho or jacket, along with a soft-sided seat cushion. Exceptions will only be made for medically necessary items. Bags that are not approved must be returned to the vehicle or discarded.

While strollers are allowed, they must be collapsible and fit underneath the seat without obstructing the aisles.

All bags, jackets, guests and vehicles are subject to search upon entering the stadium premises.

Weapons, noise makers, all audio and video recording devices, drones, iPads, Go Pros and cameras, along with cans and glass bottles, umbrellas, banners, skateboards, coolers and outside food and beverages, among other items, are not allowed.

The Aloha Stadium offers a list of important information on parking and restricted items in a “Know Before You Go” link online.

For all the latest traffic updates and lot closures on event day guests can follow the Aloha Stadium via Facebook or Twitter. Call Aloha Stadium at 483-2500 during regular business hours, or visit alohastadium.hawaii.gov for the latest updates.