Funny little protestant me had to move all the way here to Finland to get closely acquainted with the Catholic Church because of close friends happens to be Catholics!
There is quite a lot to be aware of when participating in a catholic mass being an outsider. For example you can’t go and have communion but you can join the others that participate in the Holy Communion and be blessed by the priest by holding your right hand over your left shoulder.
But the best part of it all is that the congregation keep its' parties together. Image how nice and cosy to go to the Midnight-mass on Christmas Eve and all gather for coffee and chats afterwards in the middle of the night, children and adults and elders instead of having to wake up early in the freezing morning to go to church. Well, this year it was not that cold but anyway.
So now I am considering converting to Catholicism as I prefer to sleep long in the mornings.