A few tabling tips:

Teach-ins

Teach-ins are useful for providing an array of opinions about a timely issue. They can be as short as having a single speaker, but are often an afternoon or daylong. They are most useful if organized swiftly in reaction to an event (wars, racist incident, environmental disaster). You can also use it build momentum around your campaign. To ensure good attendance, you need to choose an issue which a lot of people have heard about (either through the mainstream media or because your group has made a lot of noise), but want to know more about. A possible format is to break up your time into 30 minute segments, giving each speaker fifteen minutes to talk and fifteen minutes to take questions and for the audience to debate (both the speaker and amongst itself). Have drinks and snacks to encourage people to stay and talk.