I’m afraid I can’t offer you much advice as I’m not from that area. B&B accommodation might be your best bet, but in that area you’re probably talking in the region of £60-£70 per night minimum, however, off-season, you might be able to find something a bit cheaper.
At the moment, owing to Covid-19, it’s all a bit tricky too. Why not try contacting the local tourist information board for advice? Can the organisers of the retreat/satsang not give you some advice on this?
Sorry I can’t really be of much help.