I save all of my photos locally to my Mac in my iCloud library. They are organized into Albums by event. My MacBook is now out of space so I can no longer download the photos off my phone. I’d like to be able to move my iPhoto library to my iCloud account and have my MacBook access it from there. Is that possible? Are there instructions to do this?
No
iCloud is not a place to store things, it is a sync service and iPhoto have very limited capability to work with iCloud at all - once you get up to date with High Sierra and Photos you can use iCloud Photo Library with optimized photos on any device with limited storeage
LN
If space is an issue then you can move the library to an external disk:
Make sure the drive is formatted Mac OS Extended (Journaled)
1. Quit iPhoto
2. Copy the iPhoto Library from your Pictures Folder to the External Disk.
3. Hold down the option (or alt) key while launching iPhoto. From the resulting menu select 'Choose Library' and navigate to the new location. From that point on this will be the default location of your library.
4. Test the library and when you're sure all is well, trash the one on your internal HD to free up space.
Regards
TD
How do I move my iPhoto library to iCloud?
