As someone who has Mercury conjunct Sun conjunct the MC, and who has always worked as a writer, editor and researcher, I know that the placement of those planets in the 10th house is largely responsible for my skills and successes. While it may be true that the Moon in the 8th house is a good placement for politics, I think your Sun and Jupiter in the 10th are better indicators. A Leo Moon needs to be loved for its dramatic self-expression. You can fulfill this need through writing well. In politics, it's possible, but your Moon may have a hard time when you're not as loved as you want to be--no politician ever is!
Event planning could be good, too, if we think of it as a 5th house-related career. Your 5th is in Taurus, which loves this kind of creativity.
However, given the position of your Sun, conjunct the MC, I think you may feel more fulfilled with writing and communication.