This is the 8216th most frequent Russian word.
маевскии
"Маевский" typically refers to something related to May or the name Maevsky, which can be a surname in Russian.
Here, 'майские' is an adjective derived from 'май' (May), referring to holidays related to the month of May.
Майские праздники - это отличное время для отдыха на природе.
The May holidays are a great time for outdoor relaxation.
In this sentence, 'майском' describes a dinner ('ужине'), indicating its association with May or May-related events.
На майском ужине гости наслаждались традиционными блюдами.
At the May dinner, guests enjoyed traditional dishes.
Here, 'майский' modifies 'лес' (forest), suggesting that the forest is being experienced or appreciated in the month of May.