Free admission to national parks and park events themed on social media are among the plans for National Park Week, April 24.

The week celebrates this year’s ongoing centennial of the National Park Service.

While some of the more than 400 national parks around the country are free all the time, there are 127 sites with entrance fees, and those fees will be waived during National Park Week.

Events during National Park Week include National Junior Ranger Day, where kids can earn a badge and take part in various programs, and Earth Day projects, such as park cleanups and other volunteer activities, April 22.

The parks are also sponsoring “InstaMeets” on April 23, where you can gather with others in a designated place at a specific time to take photos and short videos to post on Instagram and other social media, using hashtags like #FindYourPark.

Details at www.nps.gov/findapark/national-park-week.htm.

If you’re on the road during Passover but would like to attend the holiday meal known as a seder, the Jewish outreach organization Chabad Lubavitch sponsors hundreds of these celebrations around the world, from Australia to Zanzibar.

Chabad will host community seders on the first two nights of the eight-day holiday, which begins at sundown April 22. Typically, a seder includes prayers, readings, songs and special food, including matzo. Locations include hundreds of college campuses, both in the U.S. and overseas.

With Orlando, Florida, becoming a popular Passover vacation spot, Chabad-Lubavitch of South Orlando will host two seders in both Hebrew and English, using handmade matzo and other kosher-for-Passover food delivered from New York.

To find a seder near you, check www.Chabad.org/Seders. Most of the seders are free but organizers ask that you let them know that you’re coming so that they’re prepared to serve the right number of guests.

Beth J. Harpaz, Associated Press