Few different ways.
(1) Reach out to universities/colleges in your local area to see if they offer Safe Zone training. They may also call it ally training, safer spaces training, or a myriad of other names. When you reach out describe what you’re looking for, i.e. “a foundational LGBTQ+ inclusion workshop” rather than a specific name. Institutions with LGBTQ+ resource centers are often good places to start.
(2) Reach out to local LGBTQ+ community centers or support organizations to inquire if they offer training.
Even if the organization that you contact doesn’t provide the training, they may be able to connect you to someone who would! Likely question you’ll be asked when you reach out are dates you have in mind, group size, and the budget you can offer.
Best of luck!