The Flatirons Photo Club holds competitions open to dues-paying members at most of its monthly meetings (see this link for more information about meetings; some meetings feature sharing and discussion of images rather than competition). There are four competition categories: Special Topic, Nature, Realism, and Special Effects. See these links on competition Submission Guidelines, Special Topics and Year End Competition for more information.
Members may enter up to three (3) images in monthly club competitions, spread across all categories. To encourage printed images, a fourth entry is allowed if at least one is a print. (Only two (2) entries per person in the Special Topic of the Month.) Digital and Print are judged separately. Awards are given to ~20% of entries in each category. There must be at least three entries in a category for an Award to be given in that category. However, any image receiving a score of 4.5 or higher — no matter how many or how few entries there are — is given an award.
Images receiving an award or honorable mention in a monthly competition cannot be re-entered in monthly competitions unless significantly reworked. But such images can be entered in the year-end competition. Images that have won awards in year-end competitions cannot be re-entered in monthly competitions or year-end competitions. In order to promote new creative work from members, we would prefer to see images created in the last two years, but substantially reworked older images are fine, too.
The distinction between the categories is one of style, not the technique used. Some images captured in the camera can be in the Special Effects category, and some images that have been extensively post processed can be in the Realism category.