In addition to the GTT events at the above links, you can find many workshops and retreats offered by certified Holotropic Breathwork® practitioners on the sites below.
Holotropic Breathwork Association North America
Holotropic Breathwork Association Europe
The following links are to GTT-approved double-breathwork Holotropic Breathwork® events that may be combined with GTT Virtual Modules to equal full module credit (up to two modules).