ES Events: Easy way to clear activity stream?

This could be one for Voices, but just checking I haven't missed anything obvious....

I'm faced with the need to clear the activity stream for some of my events.... I know I can go through as event owner / admin and delete them one by one.... but is there a way I can zap the whole lot in one go?

I check back-end Stream Maintenance but there didn't seem to be a way to search / filter based on event name.