Team Building Workshop
Group Vs. Team

Merriam Webster
Group: a number of individuals assembled together or having some unifying relationship.
Team: a number of persons associated together in work or activity.

Assemble: to bring together

Associate: to join as a partner, friend, or companion

Collins Dictionary:
Group: a number of persons BOUND together by common social standards, interests, etc.
Team: a group of people ORGANIZED to work together.

cf. Five Issues to Be Considered in Teambuilding