H is for ...........Handouts

Even if you only design them yourself and print them off, ensure that you have something in the form of a handout describing what you can provide, how you can be contacted, any offers that you have etc , ready to give away when you meet new people. When you create them yourself, you can, at least change the content and tailor it so that it is topical for the audience that you are encountering. For a large event when you know you will be dispensing numerous copies it would be worth investing in professional design and print quality.
As with Business cards it is always useful to have some close at hand at all times as you never know when they will be useful and you don't want to miss the opportunity for being remembered by a potential client.