Knocked Out & Operated On & At The Park With My Dad

Lazy dream overview:

In this dream, which took place during the day, some people possibly got knocked unconscious from behind and got operated on the back of their neck / spine and maybe head and maybe somewhere else; maybe some kind of implant(s) (possibly some kind of advanced technology) was attached to those areas.

They do not remember and are not sure what happened, I am not sure if it happened to me too or not, I only had partial memory like my memory was mostly erased.