My events have natural sub-parts — ceremony, reception, haldi, whatever. Can I organize photos that way?

Yes, and it's worth doing for big events. The file manager supports sub-albums and sub-folders, so you can split an Indian wedding into its functions or any event into logical chunks. When you upload, there's an "Upload Complete Folder" option that preserves your existing folder structure, which is a lifesaver if you've already sorted photos into folders on your hard drive. On the guest side, people get a "Change Folder" control to move between sections, so a guest looking for reception shots doesn't wade through the ceremony.