Is it rude to visit a professors office during the summer if they have not responded to my email? I understand that a somewhat similar question has been asked before, but my parameters here are slightly different. Essentially, I have been emailing a professor since early April about joining their lab. They have responded and inquired what sort of projects I would be interested in. They also remarked that they would be interested in meeting after the semester is over. Well, after final grades were input I sent an email and... no dice after two-ish weeks. This is no surprise, given that I know a student who got a response from them months after sending an email. The thing is, I am trying to join their project over the summer and well, precious summer days are about to start passing pretty fast.
In summary, I am moving close to campus next week, and I am wondering if it would be rude or brutish to go to their office location physically to follow up. Is this a bad idea? The difference between this situation and the last person who asked is that this is during summer and COVID times. I also just finished my freshman year if that matters.
EDIT: as a corollary, I could also try calling the office. Though that almost seems more incessant than showing up in my opinion. Thoughts?
It's not rude.  It quite probably is futile.

Many faculty are not in their offices very often normally.
Many faculty are in their offices less in the summer - in particular, they are unlikely to have scheduled office hours.
During a pandemic, you might not be able to go into the building anyway.

If the professor does not feel safe meeting in person during a pandemic, they'll just tell you to contact them some other way when you show up.
Do not go to a professor's office if you are sick.  Also, do not go anywhere, except for medical care.