Belfast City Hall will be lit up in rainbow colours to mark the anniversary.
Today marks 40 years since a landmark judgement, that decriminalised homosexuality in Northern Ireland.
Local activist Jeff Dudgeon took on the law that saw gay men thrown in jail - and won.
The decision also paved the way for ensuring no other EU state could ban homosexual acts.
The building in Belfast city centre is already being lit up in rainbow colours tomorrow to mark 40 years since a landmark court case ruling that led to the de-criminalisation of homosexuality in Northern Irelandhttps://t.co/gBQ1oXn4LN
— The Irish News (@irish_news) October 21, 2021

Offaly Fire That Claimed Lives Of Boy (4) And Woman (60s) Upgraded To Murder Investigation
New Figures Reveal How Parts Of Kildare Rank Among Worst In State For GP Coverage
Tomorrow Marks 25 Years Since Naas Man Trevor Deely Went Missing As Gardai Issue Appeal
Woman And Young Boy Die In Offaly House Fire
Rent Hike Fears For Students As Lawless’s Department Weighs Change Sought By Private Operators
Taxi Driver Protest Suspended Pending Outcome Of Talks
BREAKING: Green Light For €1.3bn Drainage Scheme Serving Kildare After Court Agreement
Irish Troops Come Under "Small-Arms Fire" In Lebanon