Teams calendar - explanation of what I see

 Hi, I have multiple sessions running from this one link in my calendar. I'm concerned that a second box has now appeared, and wonder if it is telling me that usage is limited (I've already had 250 participants spread over several days, and expect more - about 80 per session). What is the second box?

Can I keep on using this link as long as I don't exceed 250 people per session?

Please? Many thanks if you can help a 'newcomer to Teams'.

Janet