The only campsite near Oughterard is in Spideal or Salthill, haven't seen much going on in Spiddal.
Brigit's Garden is more a social hub and geared for Fairies and New Age recreation.
If youse are only camping for a few days, I have a lawn and a long hose for the tea.
Wild Camping is possible, it depends on the landowners or location, i.e. there is space along the coast, how some people react isn't always predictable.
Spaces along the Corrib Lake is sometimes hard to get to, the forests around so, so.
Cheers
Josey