Event Details
Operating System->Microsoft Windows->Built-in logs->Windows 2008 or higher->Security Log->Policy Change->Audit Policy Change->EventID 4719 - System audit policy was changed.
EventID 4719 - System audit policy was changed.
A change was successfully made to the computer's audit policy. 

Refer to the link to learn about Audit Policy Categories and Subcategories

Find more information about this event on ultimatewindowssecurity.com.

Corresponding events on other OS versions:

Windows 2000, 2003
 Sample: 
Log Name:      Security
Source:        Microsoft-Windows-Security-Auditing
Date:          10/27/2009 9:52:10 PM
Event ID:      4719
Task Category: Audit Policy Change
Level:         Information
Keywords:      Audit Success
User:          N/A
Computer:      dcc1.Logistics.corp
Description:   
System audit policy was changed.
Subject:
	Security ID:		S-1-5-21-1135140816-2109348461-2107143693-500
	Account Name:		Administrator
	Account Domain:		LOGISTICS
	Logon ID:		0x1806d9
Audit Policy Change:
	Category:		System
	Subcategory:		Security State Change
	Subcategory GUID:	{0CCE9210-69AE-11D9-BED3-505054503030}
	Changes:		Success Added, Failure added
===========================
Description template stored in adtschema.dll:
===========================
System audit policy was changed.

Subject:
	Security ID:		%1
	Account Name:		%2
	Account Domain:		%3
	Logon ID:		%4

Audit Policy Change:
	Category:		%5
	Subcategory:		%6
	Subcategory GUID:	%7
	Changes:		%8
Log Type: Windows Event Log
 Uniquely Identified By:
Log Name: Security
Filtering Field Equals to Value
OSVersion Windows Vista (2008)
Windows 7 (2008 R2)
Windows 8 (2012)
Windows 8.1 (2012 R2)
Windows 10 (2016)
Category Policy Change
Source Microsoft-Windows-Security-Auditing
TaskCategory Audit Policy Change
EventId 4719
Field Matching
FieldDescriptionStored inSample Value
DateTime Date/Time of event origination in GMT format. DateTime 10.10.2000 19:00:00
Source Name of an Application or System Service originating the event. Source Security
Type Warning, Information, Error, Success, Failure, etc. Type Success
User Domain\Account name of user/service/computer initiating event. User RESEARCH\Alebovsky
Computer Name of server workstation where event was logged. Computer DC1
EventID Numerical ID of event. Unique within one Event Source. EventId 576
Description The entire unparsed event message. Description Special privileges assigned to new logon.
Log Name The name of the event log (e.g. Application, Security, System, etc.) LogName Security
Task Category A name for a subclass of events within the same Event Source. TaskCategory
Level Warning, Information, Error, etc. Level
Keywords Audit Success, Audit Failure, Classic, Connection etc. Keywords
Category A name for an aggergative event class, corresponding to the similar ones present in Windows 2003 version. Category Account Logon
Object Name -
Whom -
Object Type -
Class Name -
Security ID -
Account Name -
Account Domain -
Subject: Security ID InsertionString1 S-1-5-21-1135140816-2109348461-2107143693-500
Subject: Account Name InsertionString2 Administrator
Subject: Account Domain InsertionString3 LOGISTICS
Subject: Logon ID InsertionString4 0x1806d9
Audit Policy Change: Category InsertionString5 System
Audit Policy Change: Subcategory InsertionString6 Security State Change
Audit Policy Change: Subcategory GUID InsertionString7 {0CCE9210-69AE-11D9-BED3-505054503030}
Audit Policy Change: Changes InsertionString8 Success Added, Failure added
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