Bishop Garrigan High School

Bishop Garrigan High School is an all-boys high school which has maroon and gold as the official colors for the required school uniform. It's only in the original online version and it's mentioned that Dan, the son of Frank's boss at work, Mr. Swann (called Mr. Warren in the books and the movies), goes to the school. Greg admits that his only real issue with the school is that they only enroll male students.

Frank was planning on enrolling Greg at the school for high school, but one night, when he was about to take Greg to the open-house for Bishop Garrigan High School one night in late-January, Bill Walter had to move his van so Frank and Greg could leave. However, after Bill moved the van and noticed that Frank was holding a folder for Bishop Garrigan High School, Bill revealed that he's actually a former student at the school.

Frank was so shocked by what Bill said that he ultimately decided not to enroll Greg at the school. Greg claims that after Bill revealed he went to BGHS, Frank stood there for at least a minute, like he was paralyzed or something, before go back inside their without saying another word.

Trivia

 * Since BGHS is mentioned to be a boys-only school and is also said to have a required uniform policy (of which the colors are maroon and gold), it's probably safe to assume that it's a private school—even nowadays, most private schools still have required uniform policies and quite a few private schools also still only enroll male or female students.
 * There is an actual school called Bishop Garrigan High School—it's located in Algona, Iowa.
 * Unlike the school of the same name in the online version of Diary of a Wimpy Kid, the real-life BGHS is a coed-school (meaning they have both boys and girls) and it also covers middle school in addition to high school.
 * The real-life BGHS is also a religious private school (specifically Roman Catholic), but it's also possible that the BGHS in the online version is also a religious private school.