There were a lot of people _at the party. - The party is considered a place. If "party" is used to mean a group of people, then you can use in .
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AlpheccaStarsSusanne is _in_ the meeting. It means that she is part of the meeting.For my sentence (a), you said that we can use 'at' if the party is considered a placeand 'in' if it
LaboriousThere were a lot of people ___ the party. (at/in) ...I would use 'at the party' and 'in the meeting' or 'at the meeting', but not 'in the party'.
Susanne is ___ the meeting. (in/at)