Connection Festival offers a week filled with Goa trance and a limited number of participants (1500, to be precise).
Their AfterMovie from 2018 probably gives the best introduction about what to expect:
The organisers say :
“This year we go a little later in September: September 17 to 24: Right at the autumn equinox, dancing to give entrance to the new season: when the sun is at its zenith and the day has the same duration as the night … Enjoying also those days still warm from the Natural Pools, the places and the corners and waterfalls of the Gévora River as it passes through the festival … And all accompanied by the best live performances at the Oldshool Temple: this year only and exclusively the Goatrance will have a place in the Oldshool Temple !! In our Black Dust Altechnative relaxed at chill rhythms or with the best Techno, or in the Psytrance area: this year we open the doors to the most recent psychedelic and dark sounds and give them their place in Connection Festival !!”