This is the 7473rd most frequent Russian word.
дачники
Seasonal residents or vacationers at summer cottages (dachas).
In this sentence, 'дачники' refers to people who own or rent summer cottages and visit them seasonally.
Дачники приезжают на свои участки каждое лето.
Summer residents come to their plots every summer.
Here, 'дачники' indicates individuals gathering to celebrate their community and activities related to their summer cottages.
У дачников сегодня праздник, они вместе отмечают открытие сезона.
The summer residents have a celebration today; they are together celebrating the season's opening.
In this example, 'дачник' describes a neighbor who is a summer resident and utilizes his plot for gardening or similar purposes.