e.g.

where: {
 startsAt_gt: now()
}

Or is this something that I'd manually have to configure in my prisma server?

You can pass a

new Date()

from the frontend. Do you have a specific use case in mind for which this is necessary. If so please create a new feature request on github

I wanted to try this within Prisma Admin to fech all my future 'events'

cc @huv1k

Right now you need to use

where

with data time with you actual time for example. In future there is proposal for better filtering: https://github.com/prisma/prisma-admin-feedback/issues/69