That might be worth it. It's up to you.
Anyway, right now there's no indication that Blizzard has changed the holiday in any substantive manner, and although some new items have been found on the PTR and beta, they are not on live servers, which means the run of achievements is pretty much the same. This year, Brewfest runs from Saturday, Sept. 20 to Monday, Oct. 6. As always, check your in-game calendar for your server's exact start and end times, as they'll differ slightly by time zone. The Brewfest meta Brewmaster is required for the year-long What A Long, Strange Trip It's Been, so you'll want to get this done if you're working toward a Violet Proto-Drake.