My husband, eldest child, and I actually collect material for our fake news stories and ads all year round, but it's only after Chanukah that we start fleshing the ideas out and laying them out to look like a newspaper. I start collecting all the little bits my husband has emailed himself and scour my journal for bizarre thoughts I've scribbled (off-the-wall shaggy dog stories to make people groan, truly terrible puns that would make great names for sham products, off-beat reflections about life in L.A., and so on). As Purim gets closer, we usually mix in more time-sensitive material that's based on current events.
As much pleasure as our readers get, we also get the pleasure of knowing that we're using our talents for goofiness to brighten people's Purim. (Plus, I love the voicemails people leave for a week after Purim telling us which parts were their favorite.)
What's really strange is that the more I write for professional purposes, the harder the Purim Spiel gets for me. I noticed it last year, and this year the feeling's even stronger. It's still fun to make (especially as it's a family endeavor), and I still enjoy our readers' reactions, but my energy is differently directed these days. Luckily, I have family members to keep me in line. We'll get it done even if I'm distracted, IY"H.