Working at Intel was very low-stress. You are given assignments and expected to complete them, but (at least in the case of interns) the work is very manageable, and you can rely on members of your team to be professional and help you if needed.
My manager and other members of my team held regular meetings for a long time that I wasn't invited to. I think a great internship experience is rooted in transparency and all-inclusiveness. I had to assert many times that I wanted to be included in these meetings before I started to be invited.
Advice to Potential Interns
This is your opportunity to move your career along, gain real-world experience, make new friends and have a lot of fun doing it. Just grab the opportunities presented to you by the horns and give 110% effort. You get out what you put in. Also, go to all of the meetings and as many events as possible.
Advice to Management
A lot of the events that Intel held were during regular business hours. If you're an undergrad intern, you're paid an hourly wage, so you have to constantly check with your manager whether you can count the hours of an event towards your weekly hours or not. More often than not, this results in having to put in 4-5 hours overtime at odd hours of the day. I would advise management to just be open with your interns, and give them free reign to choose whether the hours they spent at an event should count towards their weekly hours, like an honor system. If anything, this can provide character building, and does more good than bad.
Also, invite your interns to all meetings!! Transparency!!