Plenty of family-friendly workshops, festivals at the weekend:
Mountains to Sea dlr Book Festival - 18th - 22nd March
Dublin Circus Festival - 20th - 22nd March
https://www.facebook.com/events/1549564848629402/
Budding Artists & Hardy Annuals Workshops in the National Botanic Gardens - 21st March
http://www.botanicgardens.ie/news/events.htm#21mar
Spring plant fair in St Anne's Park - 21st March
https://www.facebook.com/events/348820525321923/
Drop in Activity in the National Museum of Ireland (Natural History) - 21st March
http://www.museum.ie/en/list/calendar-of-events.aspx?eventID=4604
Waterloo Day (Historical re-enactment) in Collins Barracks - 21st March
http://www.museum.ie/en/list/calendar-of-events.aspx?eventID=4603
Tiny Tot & Family Workshop at the National Gallery - 21st March
http://www.nationalgallery.ie/en/whatson/Families/TinyTots/March_21_TinyTot.aspx
http://www.nationalgallery.ie/en/whatson/Families/Family_Programme/March_21_Family.aspx
Polish-Irish Festival - 21st - 29th March
http://www.justice.ie/en/JELR/Pages/WP15000051
Silk Road Film Festival - Family friendly films in the Chester Beatty Library - 22nd March
http://www.cbl.ie/Programme---Events/Events-Schedule.aspx
Drop-in Activity in the National Museum of Ireland (Collins Barracks) - 22nd March
http://www.museum.ie/en/list/calendar-of-events.aspx?eventID=4605
Guided Tour at Kilmacurragh - 22nd March
http://www.botanicgardens.ie/news/events.htm#22mar
Family Movie Day at UCD - 22nd March
https://www.facebook.com/events/348719425324100/
Panda Play Cafe Royal Ball - 22nd March
https://www.facebook.com/events/359735874228558/
Have Fun!