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Please remind me that the meeting is on Monday so I don't forget.
Literal
Forget-not [so-that-ように] meeting [topic-は] Monday [copula-である] [quotative-ということ] [object-を] me [to-に] say please.
A complex request stacking multiple layers: ~ないように (purpose), ということ (quotative nominalizer wrapping the fact that 'the meeting is on Monday'), を + 言ってください (please tell me). である is the formal copula — somewhat stiff for a personal request. The sentence is grammatically correct but reads like a textbook construction.