There are two sections of the By-Laws that apply:
https://ice.idniyra.org/Yearbook/IDNIYRA_ByLawsIDNIYRA Regattas.B.4.a:
... Current members who have not sailed in a continental regatta for three or more years are not required to pay the late registration penalty.
IDNIYRA Regattas.B.4.b:
Novice DN racers may enter one or both regattas if two years association dues are paid. No other event registration fee will apply. A DN racer shall be considered a novice if that person has never belonged to IDNIYRA, or if their membership has lapsed five or more years. A novice must comply with all other entry requirements.