Wondering how can three things be true at the same time, three regattas (the Northwest, ISA, and Nite Nationals) tentatively called on for the same weekend?

For January 16–18, all three are in play and they are connected. Multiple fleets are trying to do the right thing without stepping on each other.

Here’s the flow-chart version, in words.

Step 1: Look North
The Northwest Ice Yachting Association Regatta is tentatively on for Lake Winnebago at Fond du Lac, starting Friday, January 16.
Classes sailing at the Northwest include DN, Renegade, Stern Steerer A, B, C, and D, and A, B, and C Skeeters.

The final call will be made by noon on Wednesday, January 14, after ice and forecast checks.

This is the first domino.

Step 2: If the Northwest Is ON
NIYA sails in Fond du Lac.
The International Skeeter Association does not sail on Lake Kegonsa.
The Nite Nationals continue watching Kegonsa to determine whether Nationals conditions exist.

Step 3: If the Northwest Is OFF
Everything shifts south.

The International Skeeter Association Regatta is tentatively on for Lake Kegonsa, but only if the Northwest is postponed.
ISA racing includes A, B, and C Skeeters, Nites, and Renegade classes.

The NIYA decision is announced at 11:00 am Wednesday.
The ISA decision follows at 11:30 am.
By noon Wednesday, it will be clear whether the ISA is on and where.

Step 4: The Nite Nationals Decision
Nite Nationals are tentatively scheduled for January 16–18 on Lake Kegonsa, for either two or three days.
This is the National Championship for the Nite class.

If the ISA is officially called on, the ISA regatta takes precedence.
The Nite Board will provide updates after 3:30 pm Wednesday, with a final decision by early evening, based on ice conditions.

In plain English:
Wednesday is everything.
The Northwest decides first.
ISA reacts to the Northwest.
The Nite fleet watches Kegonsa and defers to ISA if needed.
By Wednesday night, the picture should be clear.