It will always seem a little slow at first – especially if you don’t have a lot of shows going on. Don’t force it. If you fill your page up with spam and garbage just to keep it active, the people who have ‘liked’ it will be more likely to ignore any content from you (and therefore miss when you have important things you need to post).
As you start getting more shows, event details (before a show) and event photos (after the show) are two of the biggest traffic generators. You could also decide to post a new mix a couple of times a month, and a few times a week share some music that you enjoy that you think others might like too. But again, try to keep a natural flow to all of it, not get too spammy, and don’t clutter it up with things that aren’t focused on the brand and image you are trying to create for yourself as a dj.
As a side note, make sure you link back to your page everywhere you can – so add it to your signature here. Google notices this stuff and boosts your rankings.