Will I lose iPhoto if I upgrade to High Sierra?

I am also concerned. I recently upgraded my iMac to MacOS 10.12 Sierra. So far, iPhoto is still working.

I am aware that iPhoto is EOL'd, meaning Apple no longer supports it. This is tremendously disappointing, as Apple's new official Photos app seems to be more like iPhoto Lite, or iPhoto 2004. I have a lot of time and effort invested in organizing Events with titles that I wrote like highly abbreviated summaries. I also have alot of newspaper-style prose captions stored as metadata in the Comments pane for quite a few photos. I store this information, and more, for family members, volunteering for local civic organizations, events planning, and work projects.

I am deeply concerned that migrating from iPhoto to Photos will ruin all that metadata and organization permanently. I have over 64,000 images in my iPhoto library, dating back to before the beginning of the first version of iPhoto. (I bought my first digital camera in November 2001.)

Is there anywhere I can send feedback to Apple?