Is it possible to create Lookup or Master-Detail Relationship from Activity Object (Task/Event)?

No, it is not possible to create Lookup or Master-Detail Relationship from Activity Object (Task/Event).
Event we can’t create Text Area (Rich) field also.

Event Custom Fields Creation
Event Custom Fields Creation

We can create the following fields
Auto Number
Formula
Roll-Up Summary
Checkbox
Currency
Date
Date/Time
Email
Geolocation
Number
Percent
Phone
Picklist
Picklist (Multi-Select)
Text
Text Area
Text (Encrypted)
URL

We can’t create the following fields:
Roll-Up Summary
Lookup Relationship
Master-Detail Relationship
Text Area (Rich)

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I am Sakthivel Madesh, a certified Salesforce Advanced Developer & Administrator working on Salesforce Technology since 2011. I am currently working in Techforce Services as Sr. Salesforce Developer. I have worked on multiple technologies Like PHP, Java, Salesforce, I am very passionate about Salesforce and to earn 15x Salesforce Certification. I love Trailhead for learning Salesforce Skill and Become a Trailhead 5x Ranger too. I Love to Learn & Share my Salesforce knowledge to Salesforce Learners/Beginner using My Blog and Salesforce Community.

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