Another benefit of Laughter Yoga is there is a kind of primal tribal bonding that occurs, even if only temporarily.
This is a good antidote to the normal rejection that SAD sufferers might experience in day to day society.
There are other reported benefits such as endorphin boosts, etc.
It's not something I find easy to go to and I did chicken out going one time, but I have forced myself to go to the other sessions.
After the first few minutes when the organiser is giving the initial instructions I have felt out of place and found myself thinking 'Why am I here? This is the last time I am coming to this!' but afterwards I have felt better and realised it was worth it.