On May 25th 2016, Geocaching HQ announced the end of the moratorium on Challenge Caches in the Geocaching Blog.
Items listed below with bullet points are direct quotes from the Geocaching HQ articles above; text in bold has been provided by the Ontario Reviewer Team as clarification.
From the Geocaching Blog announcement:
Cache pages should not include recommendations, refer to venue features or emphasize available menu items as this could be interpreted as being promotional/commercial.
"Event Stacking" occurs when an attempt is made to host multiple events/CITOs in relative proximity (in location and time).
e.g. If an Event runs from 4PM to 7PM, any other Event less than 32km away should end no later than two hours before (2PM) or begin no earlier than two hours after (9PM).
With the likelihood of there being more promoted Event opportunities from Geocaching HQ, the Ontario Reviewer Team wish to make it easier for Players to host Events without them being considered "Stacked".
For this reason, the 2-hour window and 32km crow-flies approach has been implemented. In comparison, the UK Reviewer Team approach to Event Stacking requires at least 10 hours between different Events.
As per Geocaching HQ guidance:
e.g. "There have been a few DNFs, however it is a clever hide! I checked on it this morning. Check the hint!"
The number of "false positives" flagged with this process are minimal compared to the number of abandoned caches that this process will remove from the game.
Need help converting your coordinates to DD MM.MMM GPS notation? Click here to visit an external/3rd party site that may help; click here to see an example.
June 28th 2022 - Updated GRCA wording
May 3rd 2022 - Updated various permission links
April 17th 2022 - Updated London ESA links
March 21st 2022 - Updated Events/CITO guidance
February 14th 2022 - Updated Events/CITO guidance
January 15th 2022 - Updated COVID guidance
October 25th 2021 - Updated COVID guidance and Souvenir validity for Challenges
October 6th 2021 - Added Catfish Creek Conservation Authority policy
July 16th 2021 - Updated Event/CITO references for Ontario's Step 3 Reopening
July 12th 2021 - Added hyperlinks to Event/CITO references for Guidelines/Help Centre
July 11th 2021 - Updated Event/CITO guidance
July 1st 2021 - Added GPS Usage section.
June 1st 2021 - Updated COVID guidance and added URLs to Help Centre/Guidelines for several articles
April 8th 2021 - Updated COVID guidance
March 26th 2021 - Updated COVID guidance
March 1st 2021 - Updated cache type/Multi/Mystery/Traditional guidance
February 23rd 2021 - Updated COVID guidance
January 12th 2021 : Updated COVID guidance
January 11th 2021 : Added City of Hamilton for land manager/permission considerations
January 3rd 2021 : Highlighted HQ's requirement for Challenge Cache attribute
November 10th 2020: Updated wording for permission process
October 4th 2020: Updated COVID-19 Response to add info regarding agenda based content
August 28th 2020: Updated GRCA land management details
August 1st 2020 : Updated Rouge Park land management and TRCA land management policy links
July 16th 2020 : Updated Crown Land text in CITO Phased Approach
July 14th 2020 : CITO Phased Approach Posted
May 24th 2020 : Updated Rouge Park and TRCA website links
May 19th 2020 : Pre-Reviews for Ontario resuming
May 17th 2020 : COVID-19 Response - section update - version 7
April 14th 2020 : Updated text to include Geocaching HQ provided URLs
March 23rd 2020 : Updated Community First text for all cache Reviews
March 16th 2020 : Added Community First text for Events
December 6th 2019 : Added example text
December 1st 2019 : More flexible and definitive Event stacking approach
November 11th 2019 : Revised Land Manager text for Wagner Forest Management
April 2nd 2019 : Updated Social text
March 7th 2019 : Updated Event text
February 15th 2019 : Updated Social Media clarification and Event text
January 14th 2019 : Updated policy information for RARE
June 13th 2018 : Added Social Media clarification with updated guidance from Geocaching HQ
April 21st 2018 : Updated Niagara Parks URL
February 23rd 2018 : Updated Work In Progress Text
January 3rd 2018 : Modified with updated guidance from Geocaching HQ regarding event promotion
December 8th 2017 : Modified to refer to Geocaching Guidelines vs Listing Guidelines; modified to refer to Cache Pages vs. Cache Listings
August 16th 2017 : Updated London ESA info, Quick Links for Favourites/Events
June 13th 2017 : Updated URL for GRCA
Apr 2nd 2017 : Added text regarding similar/identical Challenge caches
Feb 10th 2017 : Project-GC and GSAK related events are now publishable, as per Geocaching HQ!
Feb 14th 2017 : Added direction that CITOs should not be side events for Mega/Giga events
Mar 3rd 2017 : Added section on Health Score
Mar 6th 2017 - Updated TRCA link
Upcoming Events and CITOs In Canadian Provinces and Territories
Upcoming Giga, Mega, GPS and Community Celebration Events