Dave has arranged a catered lunch for his team members to celebrate the completion of their work so they can see one another for a final time before being assigned to new teams. Dave's team is now in which stage of team development?

Dave's team is now in the fifth and the last stage.

Explanation:

There are a total of five stages in  team development are as follows  

1. Forming: At this stage, the creation of a new group starts, where the members appear collectively and become to understand each other during the communications.  

2. Storming: Once the forming stage is completed, the people will start communicating with each other in the context of the responsibility to be performed.

3. Norming: Once the duty of each member is cleared along with the power and responsibility, the group members begin settling in a society.

4. Performing: At this stage, synergy gets built between the group members, where each and everyone acts towards the fulfillment of an objective.

5. Adjourning: This is the fifth and the last stage of group development, where the group is eliminated, and the group members are isolated from each other.

Thus, Dave's team is now in the fifth and the last stage of team development as Dave has arranged a catered lunch for his team members to celebrate last time with his group before separated from each other which is done in the fifth stage is Adjourning stage of team development.