Just as the language for special occasion speaking is slightly different, so too are the ways in which you will want to deliver your speech. First and foremost, since you will be spending so much time crafting the perfect language to use and putting your words in the right order, it is imperative that you say exactly what you have written; otherwise, what was the point? To that end, your delivery for a special occasion speech will skew slightly more in favor of manuscript speaking. While it is still vital to establish eye contact with your audience and to not sound like you are reading, it is also important to get the words exactly right.
You will need to practice your special occasion speech as much as or even more than you did for your informative or persuasive speeches. You need to know what you are going to say and feel comfortable knowing what is coming next. This is not to say you should have your speech memorized, but you need to be able to take your eyes off the page in order to establish and maintain a rapport with your audience, a vital element in special occasion speaking because of the emotional component at the core of these speeches. Knowing your speech will also allow you to counteract the flow of adrenaline into your system, something particularly important given that special occasion speeches tend to be very emotional, not just for the audience, but for you as well.
Basically, knowing your speech well allows you to incorporate the emotion that a special occasion speech is meant to convey, something that is hard to do when you read the entirety of your speech. In this way your audience will sense the pride you feel for a graduating class during a commencement speech, the sorrow you feel for the deceased during a eulogy, or the gratitude you have when accepting an award.
Special occasion speaking is the most varied type of speaking to cover; however, there are some general rules to keep in mind regardless of what type you are engaged in. Remember that using good, evocative language is key, and that it is important that you deliver your speech in a way that both conveys the proper emotion for the occasion as well as allows you to give the speech exactly as you wrote it.