Activism, in a general sense, can be described as involvement in action to bring about change, be it social, political, environmental, or other change. This action is in support of or opposition to one side of a controversial argument.
There are many different forms of activism; a select list follows.
... in Northern Ireland, Museums in the Republic of Ireland
Berkshire
Reading Museum[?] (Replica of the Bayeux Tapestry)
Buckinghamshire
Bletchley Park Museum[?] ...