Dated pages are planned expeditions which have not yet been attempted by any geohashers. When the date of the expedition is past (with enough time for late write-ups) the not-attended expeditions should be categorized under Category:Not reached - Did not attempt instead (This is a change implemented in 2015, both categories had other "rules" before).
Scroll through to the pages with titles that are not dates to find pages with information that may be helpful in planning your own expedition.
Pages in category "Expedition planning"
The following 11 pages are in this category, out of 11 total.