Widgets (category)
| dynamic_sidebar_params | Allows you to change the parameters passed to a widget's display callback. |
| in_widget_form | Fires at the end of a widget settings form. Allows you to output additional fields for classic widgets. |
| sidebars_widgets | Allows you to change the list of sidebars and the widgets assigned to them. |
| widget_title | Allows you to change a widget title on the front end. |