Some of the things I remember are probably universal.
Playing out on the streets. There were so many kids in my working class estate (no contraception back then). In summer we'd be out as soon as we'd had breakfast and we'd only come home for a quick sandwich or when we were called in for dinner or bed. Skipping, chasing, hide and seek, playing tennis, riding our bikes etc.
Buying and writing postcards when we went on holiday. And by holiday I mean a holiday at home in Ireland 'cos we couldn't afford to go abroad. You'd have to find a post office to buy stamps before you'd head home. Wealthier relatives would send them from abroad - exotic places like Blackpool or Spain. My Dad still sends postcards as do two of my siblings, but I don't bother myself. DD thinks it's a very quaint custom. It's definitely going to die out with the next generation. Why would you bother buying and writing a postcard when you can just take a photo of yourself and stick it on Instagram? Same with Christmas cards.
Calling neighbours Mr. or Mrs. Murphy as a mark of respect and never by their first names. My Mam's close friends were Auntie Mary and Auntie Kathleen.
It was considered very unlucky to buy anything for a baby before it was born - like tempting fate. You just bought the basics close to the due date. My Mam would have been horrified at the notion of a baby shower.
Kids scrambling for coins after a wedding was called a grushie here. Or was it gushie? I don't know if I've spelt it right because I've never seen it written down.
Hallowe'en has always been popular in Ireland but we made our own Hallowe'en costumes as kids. And when we knocked on doors chanting, "Help the Hallowe'en party", we'd just be given monkey nuts and the odd apple or mandarin. The only person who gave us sweets was the local shopkeeper.
There were lots of other traditions which are probably exclusive to an Irish/Catholic upbringing. We didn't realize it at the time but our lives were dominated by religion.
Going to confession on Saturday mornings and making up sins because you weren't going to confess your actual sins. Or maybe you had nothing to confess.
Going to mass on Sunday mornings.
Religious processions at certain times of the year - Corpus Christie and Mayday processions.
Not eating meat on Fridays.
Giving up things for Lent. A lot of time and thought was put into what you'd give up and it was a conversation topic around that time of year - adults would ask you what you were giving up for Lent just like they'd ask what Santa was bringing you for Christmas. Kids would give up things like sweets, chocolate, crisps, biscuits etc. and adults would give up sugar in their tea or cigarettes or alcohol. If I asked DD what she's giving up for Lent, she'd look at me as if I had two heads
.
Holy Week and all of the services/ceremonies associated with it. On Palm Sunday, men would walk through the church carrying big palm branches - can't quite remember why. On Ash Wednesday/Spy Wednesday you'd receive ashes and compare your blob of ashes with your classmates'. We didn't really take it all that seriously. Holy Thursday was just a mass iirc. Or maybe that was the day when the priest would wash the feet of some of the congregation? Good Friday was the worst. It was supposed to be a very solemn, sad day because Jesus died on the cross for our sins. There was a verrrry long service called the Stations of the Cross which went on for hours and involved saying lots of rosaries. The Stations took place at 3 o'clock because that's the hour Jesus died. A lot of shops closed at 3 o'clock as a mark of respect and to allow their staff to attend the Stations. We weren't allowed to watch TV because, you know, Jesus died for your sins (spotting a theme here?) and if Dad did put the TV on (in later years), it would be to watch a religious film on RTE. You couldn't eat meat (because it was Friday) but it was a day of fasting, so you were supposed to eat three small meals and no snacks etc. And you couldn't drink alcohol at all. Restaurants weren't allowed to serve alcohol on Good Friday and pubs didn't bother to open because what's the point in opening a pub if you can't serve alcohol. This restriction was only lifted in 2018!
There was also a ceremony attached to a saint (Saint Blaise) - the priest would bless your throat and it was supposed to ward off sore throats and throat related illnesses. Google tells me this is the 3rd February.
I'm an atheist now and I'm glad that we (as a nation) have thrown off the shackles of Catholicism. But there was a rhythm to it all that I sometimes miss. Or maybe it's the social aspect that I miss - chatting to all your neighbours after mass on a Sunday, sleepy little kids clutching their toys at mass on Christmas morning etc.