or

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1-He wants to participate in a political discussion or quizz programme.
2-He wants to participate in a political discussion or a quizz programme.

Which of these sentences means a and which means b:
a-He wants to participate in a political discussion programme or quizz programme.

b-He wants either to participate in a political discussion or in a qyuizz programme.
(The political discussion isn't a programme.)

1 is a
2 is b

and i would spell it 'quiz program', brits might spell it 'quiz programme', but i'm pretty sure no one spells it 'quizz programme'