Looks like it's World Social Work Day on Tuesday (15 April), which the International Federation of Social Workers is co-ordinating.
A number of countries' associations have posted details of events they are organising. For instance, the Association of Social Workers in Kuwait is surveying practitioners about their views on how to upgrade the profession.
The general theme is "Social Work - Making a World of Difference" which is a nice slogan.
I'm not sure of events going on in Britain - does anyone have any ideas?