Congratulations to all of the new Aggies! 
Obviously housing, dining, roommate selection, etc. all changed this year. Although courses were virtual, UCD dorms were open to students with each room being converted to a single. The dining commons were take out, opened for a short time and then reverted back to take out again. This all depends on which California Blueprint for a Safer Economy tier Yolo county is in. Here are links to last year’s dorm discussion and two years ago.
If you are interested in seeing what the dorms look like, check out the Aggie Abodes videos.
Many UCD clubs and organizations use FB Groups to communicate. If students don’t already have a FB account, I would encourage them to create one. There is a UC Davis Freshman Class of 2025 (Official) Facebook group that has UC Davis Housing and UC Davis Undergrad Admissions as administrators. There are also other UC Davis 2025 FB groups that claim to be official or have hidden members but are often run by 3rd parties not affiliated with the school and have members who are not affiliated with UCD. Always be cautious when sharing personal information on social media.
If you are planning a visit, Information for campus visitors includes a link to the Daily Symptom Survey that visitors need to complete before going onto campus.