Research Dumps in Your Manuscript

Writer friends....what are your thoughts and/or practices about including facts from your research in your MS?

My current project is set in Oaxaca (pronounced Wa-hawk-a) Mexico during Day of the Dead festivities. THERE ARE A MILLION COOL AND INTERESTING FACTS ABOUT THIS PLACE AND THIS HOLIDAY. All those facts are great for nonfiction books and travel guides, however info dumps like that make for great big road blocks in the progression of your fictitious story that is not, I repeat to myself, not primarily about all those cool and interesting facts.

So right now, I'm taking a sprinkle lightly and pepper approach for info that relates most directly to the story. Realizing that I am probably still being a bit heavy handed with the information shaker.

Have you written a book that required the judicious use of research. How did you handle info dumps?? Any words of advice...