Grabarka's biggest feast is the Spas (Day of Transfiguration of the Saviour) on 19 August. The ceremony begins the day before at 18:00 and continues with Masses and prayers throughout the night, culminating at 10:00 with the Great Liturgy, celebrated by the metropolitan of the Orthodox Church in Poland. Up to 50,000 people may come from all over the country to participate.

On the 18 August the surrounding forest turns into a car park and camping ground. Cars and tents fill every space between the trees. Despite this wave of modernity, the older, more traditional generation comes on foot without any camping gear and keeps watch all night. The light of the thin candles adds to the mysterious atmosphere.

If you wish to experience this magical night, you have the same options - to pitch your tent or to stay awake. The commercial community is well represented, with plenty of stalls selling food and drink and a variety of religious goods, including CDs and cassettes of Orthodox church music.