Expect growing pains. You can't please everyone, so seek reasonable compromise and treat all ideas with proper respect. Don't expect everyone to be as excited as you are, but encourage gatherings and activities among members. These can be formal or informal, and cover whatever subject you can get the people and materials to work on. They are generally scheduled during an evening or on a weekend day when there is no local event going on.
Topics can be as broad as writing period poetry or making period shoes.
Pick a topic on which several individuals in your group would like to work or learn. Have someone available at the workshop that can act as an instructor or can answer questions. Specify, prior to the workshop, whether individuals need to purchase their own materials or if they will be provided at the workshop. If there is a cost for the individual, they need to know this well a head of time. Let individuals know how long the workshop will last and what time it starts and ends.