Added a party clarification...
**Back to back parties just means that's all your Sim would do besides eating, sleeping, etc. -- no working on other bingo squares. Also, all party types (wedding, birthday, etc) qualify, but dates are not parties.
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The tombstone square is similar to the household funds square. Once you get the 250k or have a tombstone on your lot, those squares are done. No need to maintain those things until the end.