Every year there is a day that promotes starting every conversation with “Shwmae” or “Sumae” to bring Cymraeg out into the public more and encourage its use. This year it’s on Sunday 15th October, with some schools celebrating it on either Friday 13th or Monday 16th.
How about greeting as many people as you can with “Shwmae” or “Sumae” on that day? But of course there’s no reason to stop. The more people you greet in Welsh, the more chance you have of finding Welsh speakers!