Do they schedule them the same weekend every year? IIRC They did it at least the last couple of years.
Tailhook books its event years in advance to ensure it has the hotel whereas the Oceana Airshow date is driven buy the Blue Angels and that date is decided upon in early December every year at the ICAS conference. By then Tailhook can't switch their date. Can't figure out why they can't or won't deconflict the dates, but they're the same weekend again this year.