Randy Long and his daughter Ava, 4, hold a sea star collected at the UC Davis Bodega Marine Laboratory. Wayne Tilcock/Enterprise photo

Under sunny skies and with temperatures in the low to mid-80s, an estimated 100,000 people enjoyed a day full of Aggie Pride as they celebrated the 102nd Picnic Day.

The campus open house — believed to be the largest student-run event in the country — included more than 200 family-friendly activities and events on campus.

The celebration got off to a rollicking start with a lively parade that started on campus and wound its way through downtown before ending up back at the university.

Later, crowds gathered in The Pavilion to watch wiener dogs race their little hearts out and in front of Mrak Hall to hear musicians from several colleges play their best in the Battle of the Bands.

As much as the day brought cheer, it also featured plenty of beer, as Davis police and firefighters responded Saturday evening to dozens of alcohol-related incidents that typically mark the university’s open-house weekend.

The Davis police force bulked up its patrols Saturday, with plenty of officers looking after congested blocks in the downtown core. Meanwhile the Davis Fire Department saw a steady influx of calls throughout the day, noting at least 35 calls by press time Saturday.

“Most of the calls have involved alcohol, but there hasn’t been anything significant,” said Division Chief Joe Tenney.

The exact number of citations and arrests was not available, but no major incidents were reported by press time.