Welcome to Belfast's Gay Scene.  As Belfast is the second largest city in Ireland and capital of Northern Ireland it has also the second largest gay scene - taken from www.gaybelfast.net

Bars and Clubs (Located within Queer Quarter, Belfast):

Kremlin:
Belfast's best gay owned dance club for men and women.
The Kremlin is located at Donegall Street.
Klub180 every Tuesday 10pm to 2.30am (All drinks £1.80, Admission £3, £1.80 for students)
Deuce Thursdays 10pm to 2.30am (All drinks £2, Admission £2)
Karnival Fridays 9pm to 3am (Admission free before 10pm, £4 before 11pm and £6 after 11pm)
Revolution Saturdays 9pm to 3am (Admission free before 10pm, £5 before 11pm and £10 after 11pm)
Industry Sundays 10pm to 2.30am (Admission free)
See www.kremlin-belfast.com for more details.

Union Street Bar (and Restaurant):
Belfast's trendy award winning gay bar open daily from 12 noon til late. 
Situated on Union Street.
Entertainment every night from 9pm.
Drinks promotions available
See www.unionstreetbar.com for more details.

The Shoe Factory@Union Street Bar:
Slosh
every Wednesday 10pm to 2am
BuBu (Bear night) First Friday of the month 10pm to 2.30am
Sunday Bingo Show from 8.45pm
See www.unionstreetbar.com for more details.

Maverick Bar: The old Front Page Bar has been transformed into Belfast's Newest Gay venue. This lively gay bar is a great alternative at Union Street. Open every night.

Boom Box: The newest gay club in Belfast, situated beside the Maverick Bar. 
Open Friday, Saturday and Sunday nights to 3am. See facebook page for more details.

Others:
Forbidden Fruit presents MILK-it MONDAYS @ T-Street Warehouse: Every Monday 10pm to 3am. Located at 10-14 Tomb Street. 

For information on other cities in Ireland;

Gay Cork

Gay Dublin