You've got to have fun. Regular pep-talks leading up to the big day can be a big help and keep your mind off negative stimuli that may upset you. Be confident. Act as though the audience has begged and pleaded for you to be there in the first place. Know that they want to hear you talk. This allows you to open up and present yourself. While delivering the speech, make eye contact with people throughout the room or talk just over their heads if you prefer. Speak slowly and let your voice resonate. Most importantly, be yourself. Come alive by reliving the experience instead of simply reading from notes or reciting a memorised speech. Keep the passion and spontaneity alive. That's what they'll remember for sure.