First script or not, there are some things that will be of help to you as people give their opinions. There is no acknowledgement of a correct answer... there is no scoring mechanism typical of most trivia games.

Second, where the trivia is turned on and enabled, your message to the channel reads that

msg $chan 4Trivia game is not activated by $nick.

Shouldn\'t this be changed to state that it IS activated by $nick since it is enabled by the command?

Third, the / symbols are not required, as where you have /enable you only need to write enable. At the start of the script you may wish to write something like

#Trivia on

and the last line as

#trivia end

then the code can be turned off or on.

Fourthly, I don\'t see the necessity of having others turn trivia on or off... what happens if they don\'t? Perhaps you can scrap turning the script on or off if it has open access and merely commence the script from the line if somebody type !trivia, the questions flow through to the end since their is no loop to continue the questions once complete. Just an idea.... or two