Garda Ticket Checkpoints will be set up on approach routes to Slane Castle ahead of Harry Styles' gig next month.
The former One Direction star will play the Meath venue on June 10th.
Promoter MCD has called on fans to come weather-ready, leave three hours travel time and learn about the Halo Effect.
This is to alert medical staff of a person who is ill in the crowd.
You shine your flashlight at the sky and stand in a circle to get their attention.
Dressing for the weather is always a good idea, even if it's sunny maybe bring a jacket.
We all know how dodge the Irish weather is at the best of times.
⭕️ Everything you need to know ahead of #HarryStyles sold out concert at #SlaneCastle❗️
✅ Please visit https://t.co/oxZDjv5bkc for more... pic.twitter.com/f5grcGl53q— MCD Productions (@mcd_productions) May 30, 2023
St Annes Park
Meanwhile, if you're heading to gigs at Dublin's St Anne's Park next month, you are being urged not to queue up until the gates open.
The Lumineers, Soft Cell, Lionel Ritche, The 1975 and Pulp will play the North Dublin park in early June.
Fans are being advised to dress for the weather with suncream - and also to use public transport to get there.
Promoter MCD says glasses, cans, alcohol, umbrellas, selfie sticks and flares are among the banned items for the concerts.
