noun
open date; start of a season
Refers to the first day when a ban or restriction is lifted, especially for hunting, fishing, or seasonal activities.
今年の狩猟の解禁日は11月15日です。
The hunting season opens on November 15 this year.
解禁日を待ちわびている釣り人が多い。
Many anglers are eagerly awaiting the opening day.