Looking for some recommendations for a family 90th birthday party.

Looking for venue in South Dublin/ Dublin City function room/private space that would accommodate around 120 people that can cater finger food/ buffet set up.

We were going to do a DJ as entertainment (still an option) but we had a family wedding last year and she really enjoyed the liveliness of the wedding band so now we are thinking a band would be better. Style of music we would look for is Rat Pack band/ band with brass section (big band style) . People attending the party would be 25-90 age so something everyone will enjoy.

Such a special occasion we want to make it a night to remember!

Thanks All!