KISS (Keep It Simple)
Get your audience’s attention with a very clear and to the point headline and a bold graphic that can be seen from a distance.
In the simple example on the left, I am using a silhouette of a guitar player, which hints at the subject of the poster. I also use a very simple and direct headline, “In Concert" — no ambiguity in that! I then make the name of the band prominent by making the type larger and using a different typestyle to make the name stand out and look like a logo. If your band already has a logo, of course you need to use that instead. If they do not, I would recommend looking at the band’s name in different typestyles and finding the one you like the best and sticking to it; again to “brand" yourself. Hopefully, by now, the audience has been drawn in for a closer look at the rest of the information on the poster that is in smaller type but still readable (when it's full size.)
JUST AS NO ONE LIKES TO READ POSTS IN ALL CAPS, NO ONE LIKES TO READ POSTERS IN ALL CAPS ALL THE SAME SIZE TYPE.
Not only is it a typical case of bad typography that you want to avoid, it makes your posters or any type DTP project appear amateurish if you use all caps. They can be used sparingly, as I have in the logo of the band’s name, but the time when using all caps for a headline died out with the typewriter. Another thing to avoid is using more than two or maybe three typestyles at the most. Also, either center your type or line your type on an imaginary left or right line, to keep the whole thing from looking messy. Also avoid using lots and lots of cute clip art -- it's just tooooo cute!