Class D stations may work all other Field Day stations, including other Class D stations, for points.
An aggregate club score will be published, which will be the sum of all individual entries indicating a specific club.
The ARRL Programs and Services Committee has adopted two temporary rule waivers for 2020 ARRL Field Day, June 27-28.
1) For Field Day 2020 only, Class D stations may work all other Field Day stations, including other Class D stations, for points.
Field Day rule 4.6 defines Class D stations as “Home stations,” including stations operating from permanent or licensed station locations using commercial power. Class D stations ordinarily may only count contacts made with Class A, B, C, E, and F Field Day stations, but the temporary rule waiver for 2020 allows Class D stations to count contacts with other Class D stations for QSO credit.
ARRL has contacted logging program developers about the temporary rule waivers so developers can release updated versions of their software prior to Field Day weekend. For those using N3FJP the changes were made with the release of Version 6.3. https://www.n3fjp.com/Revision/FDRevision.htm As for N1MM+ they are aware of the change and will be pushing the update out soon.
2) In addition, for 2020 only, an aggregate club score will be published, which will be the sum of all individual entries indicating a specific club (similar to the aggregate score totals used in ARRL affiliated club competitions).
Ordinarily, club names are only published in the results for Class A and Class F entries, but the temporary rule waiver for 2020 allows participants from any Class to optionally include a single club name with their submitted results following Field Day.
Read more about the temporary rule waivers.