There are many mindfulness retreats happening all over the world. Here are a few that I would recommend. Let me know if you have any suggestion and I shall investigate and consider posting on here too:
Insight Meditation Society – The Insight Meditation Society’s Retreat Center first opened its doors over 30 years ago, providing meditation instruction based on the teachings of the Buddha. Today, it offers a yearly schedule of meditation courses, designed for both new and experienced practitioners, lasting from a weekend to three months. Most retreats run for 7-9 days, and are taught by recognized insight meditation teachers from all over the world.
Learn Mindfulness Retreats – We offer mindfulness retreats in different locations over the world. The group sizes are small and usually the retreats are not too intensive. We encourage some socialising and create a relaxed atmosphere rather than being too serious. Most of our retreats also include a certificate to show you have completed professional mindfulness training.