Write down a few possibilities about what you want your poster to say. People only take a few seconds to look at a poster, so your title must tell them everything you want your poster to convey in a short, precise phrase.
Avoid using "to be" verbs, participles and lots of small words. The phrase "We would like you to celebrate with us," takes much longer to read than "Celebrate with us!" The second example conveys effectively that someone is planning a celebration.
Write your title near the top of your poster, using stencils and paint or a large, thick-tipped marker. Make your title large and print it in a neat, readable font. All capitals capture attention and can be printed neatly. People generally read posters from top to bottom.
Allow space between your title and the rest of your poster.