Please note that the hint sheet is only the options directly within a character's route that will provide romance points. To get to Ogata's Weekend 3 event, in addition to choosing those options, I would recommend 1) ignoring Yuusaku or rejecting his pamphlet at least 4 times and 2) making sure that you select either "Ask if Ogata wants to help make the party better" or "Ask if Ogata wants to hang out" (if there is no party). He should agree to this if you have enough romance points. If he instead says "..." and then "No. Absolutely not. The fuck?" it means you have failed his Weekend 2 event. Check your to-do list to make sure that it has "Meet Ogata at 5 PM next weekend" on it after the Weekend 2 event and then "Meet Ogata at 5 PM today" during Weekend 3, as that is the indicator that you succeeded.