One of my favorite writers is Diana Davis. This article on How to Celebrate a Church Anniversary comes from her book Fresh Ideas: 1,000 Ways to Grow a Thriving and Energetic Church.
We have posted numerous articles/excerpts from this book with Diana's permission and they have all been hits. If you are preparing to celebrate a milestone anniversary in your church (whether it's 5, 5, or 150 years) you'll want to check out Diana's practical ideas in the article How to Celebrate a Church Anniversary
You may also want to check out her newest book, Fresh Ideas for Women's Ministry: Creative Plans and Programs that Really Work.