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---
title: darktable.register_event
id: darktable.register_event
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weight: 190
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draft: false
author: "people"
---
```
function(
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event_name : string,
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event_type : string,
callback : function,
... : variable
)
```
This function registers a callback to be called when a given event happens.
Events are documented in the [event ](../events ) section.
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* **event_name** - _string_ - The name of the event used to manipulate the event. The combination of event_name and event_type must be unique. **API 6.2.1**
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* **event_type** - _string_ - The name of the event to register to.
* **callback** - _function_ - The function to call on event. The signature of the function depends on the type of
event.
* **...** - _variable_ - Some events need extra parameters at registration time; these must be specified here.
