Sorry you're stuck but there's almost always a pretty easy fix! Do NOT try to start all over again, eg. uninstall Max's Pitch Package, etc. That can make things worse.
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I have searched the FAQ and did not see anyone with the same issues on step 111. I looked at previous posts on the forum but could not figure out the issue. I do not see "MEETING ID" in the second box. I provided a screenshot of the issue and another screenshot I saw someone else sent on the forum that helped in their assistance.
Yeah, it looks like your Meeting Attendance object is missing the Meeting ID field that you were supposed to add in Steps 78-82. Try going to Setup > Object Manager > Meeting Attendance and then do Steps 78-82 but in Step 82 just click Save, not Save & New.
Then Step 111 should work for you, ok?