Your Band Reaches an Anniversary Date. Don't let that five-year band anniversary pass without fanfare. This angle will work better if you tie in an event or giveaway along with it. Your Band Is About to Perform a Milestone Gig. I've seen a few bands successfully promote their 100th, 200th or 500th gig.
TV shows do it.
A Member of Your Band Has an Interesting Day Job. Publicity isn't limited to what you do onstage or in the studio. Think about how you can use your day gigs to promote your band gigs. Issue a press release on where you stand, and position yourself as a possible spokesperson on the topic. You just might be contacted for a quote.