Hi @Paint Cabin,
Welcome to the Community! It’s great to hear you want to implement different strategies like a referral program into your business.
There are a number of partners that offer Referral Share events but this is not a Klaviyo native feature. While Klaviyo doesn't yet offer a referral Integration, many customers find Smile.io, Swell Rewards and LoyaltyLion integrate best. Talkable has been able to add people to the master list; it's not a prebuilt integration, but something their support team can help customers accomplish.
For the tech savvy folks (or those with access to a developer), you could also use Track API to send a custom event if they wish.
For those without a developer, I would check out our Klaviyo Partners to find a developer to work with you!
Hopefully other community members could share more about their experiences adding referral programs to give you and others who find this post some additional insight!
Have a good day :)
Alex