Classroom or auditorium style:

Hold a session on how to search the portal.

Discuss the benefits of having a login profile.

Walk through the value of having a My collection and My history page after creating a profile. 

Conduct a few image searches together.

Ask the audience for topics of interest.  

Search for your community on the portal 

Watch some tutorials on how to search 

Take a look at local yearbooks from the years the audience members were in school 

If Adventure Lab has a site in your community - go for an adventure and take a walking tour of the area as a group, or challenge them to do so prior to, or after your presentation as added content.