We have an upcoming meeting where we'll have a "round robin" of demonstrations by about 10 of our own members. Each will have a table & about 10 minutes to demo a technique - needle-turn applique, bindings, paper piecing, etc. The rest of the membership moves from table to table to see each demo. Some of the "teachers" will even have hand-outs.
If your guild is smaller, you could have fewer tables & longer demos.
Our guild did this last year, and it was the most popular meeting of the year. Just keep in mind that you want to keep the groups at each table small enough that everyone can see what's being demonstrated.