One big software PROJECT that we all work on throughout the semester
Several smaller software PROJECTS that we work on, say one per month
WORKSHOPS where we all meet up together to learn some skill or technology
LECTURES where an "outsider" (say, professor or alumni) teaches us some topic
LECTURES where an experienced club member teaches us some topic
Attending EVENTS (say, we all attend a hackaton together)
Organizing our own EVENTS for others to attend