Surprise your co-worker by giving her a shower at work. Just be sure to check with your employer before planning this. Leave an inter office memo inviting everyone either on each person's desk or in their work area.
Take a collection and order from the local pizza or deli. Reserve a space to hold the party. Clean it if necessary.
If you have enough
time for the bride to open gifts, do so. If not, take up a collection
and present the bride with a gift of cash. Decorate
the area with helium balloons and pretty paper plates, napkins, etc.
This way set up and clean up are fast and easy.