Fi in NZ - unfortunately Jim Mageean's lunchtme maritime singarounds in the Endeavour don't start until the Sunday (and I missed Sunday this year because I went to Glaisdale). They aren't exclusively shanty sessions, but shanties are always sung, even when not directly or remotely relevant to the theme of the day. The session specifically for shanty singing is Wednesday - also the silly shirts day. The winner of the silly shirt competition gets to keep the collection duck for a year, so they can fill it with money in aid of the Whitby lifeboat.