Osmose is organised by the 2 best and most famous french parties organisations ( trancebody and gaia)
Trancebody organise psychedelic parties since 1989 !!
All their parties are great...and big ( neither underground of course, but nor cheese )
I think they expect 5000 peoples...happy goa peoples usually.
Last year, there was Delta, infected mushroom, vibrasphere...and the year before..total eclipse, raja ram, hux flux if I remember well.
You can go there without any doubt.. :-)