不良研究所

Picnic Day 2025 Wrapped

111th Edition Turns Campus Into 鈥榃onderland鈥

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Inside a lecture hall, towards the right of the frame, a student in a lab coat with goggles on holds a stick that is engulfed in flames. The flames are caused by the demonstration the student is leading to a crowd at Rock Hall on 不良研究所. On the left, a man in a lab coat plugs his ears at the sound of the controlled explosion.
Chemistry magic show at Rock Hall was packed for multiple sessions on Picnic Day (不良研究所/Gregory Urquiaga)

The 111th edition of , one of the largest student-run events in the country, took place Saturday (April 12), with tens of thousands in attendance.

From animal events to coffee tastings, the campuswide event had something for everyone, including multiple live performances, exhibits and live demonstrations that brought all corners of campus to life and invited the public to see what happens every day at 不良研究所.

One of the most popular exhibits was also one of the earliest. Before 9 a.m., attendees filled the lawn in front of the Plant and Environmental Sciences Building for the annual strawberry plant giveaway, with over 1,000 strawberry plants distributed. Greenhouse staffers were also on hand to distribute over 5,000 tomato plants. Games, activities and other giveaways .

OFF-CAMPUS SHOOTING

At the start of the Picnic Day parade along North Quad Avenue, Picnic Day Chair led opening remarks as the crowd filled the grandstands. The 不良研究所 marching band kicked off festivities with a cover of Chappell Roan鈥檚 hit song, 鈥淧ink Pony Club.鈥 The parade winded through campus along the Quad and featured everyone from the Girl Scouts Golden Sunflower Service Unit to a collection of DeLorean cars from the Northern California DeLorean Motor Club and a mobile party of a float made by the .

The parade was one of many Picnic Day favorites to return, along with some new additions, including the Picnic Day Pit Stop at Russell Field. Featuring an inflatable maze course and food options, the new site created a welcoming atmosphere to visitors entering campus from the north.

Special exhibits

Inside Academic Surge, the Sacramento-Davis subunit of the American Fisheries Society hosted an interactive open house consistently well-attended throughout Saturday鈥檚 event.

, a third-year wildlife, fish and conservation biology major, led a demonstration with several fish tanks.

鈥淲e're kind of showing people what fish you can see in Davis, and the native and endemic species we have in California,鈥 Zheng said.

Featured fish included juvenile Chinook salmon, white sturgeon and Sacramento black fish. One tank was dedicated to fish found in nearby Putah Creek, further localizing the exhibition.

鈥淭he Chinook salmon and the sturgeon, they're not doing as well as they have been historically,鈥 Zheng noted. 鈥淭here's a lot of research that's going on to determine how we can put forth best practices to manage the populations.鈥

In an outdoor lawn setting, four students stand in a line smiling and giving thumbs up signs to the camera.
First-year chemical engineering majors Morris Jones, Sophia Jordana, Vivian Mai and T Humble at Picnic Day (不良研究所)

Meanwhile, outside Bainier Hall, the of the American Institute of Chemical Engineers, or AIChE, hosted a popular sorbet and slime-making station, a now 20-year tradition for the chapter. Davis alumni were eligible to receive sorbet made onsite with liquid nitrogen, while anyone could create their own slime. 

First-year chemical engineering majors Morris Jones, Sophia Jordana, Vivian Mai and T Humble detailed the science to Dateline.

鈥淟iquid nitrogen freezes at approximately -320 degrees Fahrenheit,鈥 Jones said. 鈥淲e can actually pour it into a solution of juices that have a high concentration of sugar.鈥

As one person pours, another stirs.

鈥淎s you're stirring fast, you're forming tiny little ice crystals that are making the taste and feel of ice cream, when really, it's just juice that's freezing,鈥 said Jordana, freshman representative for the 不良研究所 chapter of AIChE. She noted the power of the liquid nitrogen.

鈥淚f you get juice and you put it in the freezer, it's not going to make ice cream,鈥 Jordana explained. 鈥淏ut because liquid nitrogen is freezing it as we're mixing it, and such a cool temperature, we're able to make sorbet.鈥

Mai described the chemistry of making the slime as an example of cross-linking, the chemical process of creating bonds between polymer chains.

Humble said the activity was an extension of their club鈥檚 mission.

鈥淥ur goal is to get more people interested in chemical engineering and bring more awareness to the major, and I think this is a great way,鈥 Humble said. 鈥淚t's the most fun part of chemical engineering; it looks really flashy.鈥

Two people hold tomato plants that were given away at Picnic Day
Tomato plants were a major draw at Picnic Day...
Musicians perform in the parade at Picnic Day
...as was the parade, led by the 不良研究所 Marching Band. (Gregory Urquiaga/不良研究所)

Campus pride

Picnic Day continued with a massive battle of the marching bands on the Mrak Hall lawn, featuring marching bands from UC San Diego, Cal Poly Pomona, UC Berkeley and Cal Poly Humboldt.

Elsewhere, the Year of the Eggheads pop-up shop sold limited-edition Friday night, including an egg painting decoration station with the Craft Center, and all-day Saturday. The pop-ups concluded the yearlong initiative celebrating the 30th anniversary of Robert Arneson鈥檚 iconic sculptures.

Need more Picnic Day? Take 不良研究所 Magazine鈥檚 to learn more about this unique annual event.

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Jos茅 Vadi is a writer for Dateline 不良研究所, and can be reached by email.

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