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Siva Krishna KondapalliSiva Krishna Kondapalli 

906F0000000BJQYIA4

User-added imageI am trying to assign a false value to the  (which is a check box and default value is true)in batches but, i am getting a error field is not writeable
PriyaPriya (Salesforce Developers) 

Hey Siva,

Do you have access to "IsRecurrence2" field? kindly check the access on your profile.

Also are you able to update the field from record page if you have the access?

Thanks & Regards,

Priya Ranjan

Ruwantha BulegodaRuwantha Bulegoda
Hi Siva,

This is a read-only field in Salesforce. You can not edit it as per the documentation. Check the below link. 
Mark this answer as the correct one, if it clears your doubts 
User-added image
https://developer.salesforce.com/docs/atlas.en-us.object_reference.meta/object_reference/sforce_api_objects_event.htm