But I didn't know an announcement was a thing with TSCC, I mean I spent so many years in there and attended who knows how many baptisms and never once received any sort of announcement
In the Catholic Church it is not unusual to send out invitations to a party or reception for a Baptism/First Eucharist/Confirmation. But only to close friends and family members. I've never heard of other faiths doing so--since parties and receptions don't happen and with Evangelicals Baptisms are kind of on the spot. And Mormons? Usually only wedding announcements.