Fatbjork I have been compiling & delivering pub quizzes for years.I am aware of my audience who also have different levels of intellegence.
Firstly dont make it to hard, topical questions are always popular eg who left office on the same day as Blair = Prescott.Read papers, watch the news
If you think the question can be a bit difficult offer a muti-choice of 3 possible answers
Popular themes are TV, films, sport, music anagrams at half time. geography, history, colours of the london underground, monopoly board ie name the 4 stations, name the 5 sons in Thunderbirds etc Royal family british PMs US Presidents hope you find these useful (I have) However, the one thing you will never do, as I, is please everybody, but yopu can show them that at least you are trying Good Luck Steve