plan for Nerofest:

>do ALL missions once to get the guaranteed rewards
>check chart (http://fate-go.cirnopedia.org/quest_event_20150916.php#nav) and look on the bottom of each mission; that's the random rewards you can get (note that they have shit like 33% drop rates instead of fucking 2%)
>farm the fuck out of the ones you need
>use medals to clean out the shop for the rare materials like Homo Babies and so on

Bonus round:

>set up your EXP on the days before Nerofest so that you only need a tiny bit of EXP to level up, thus allowing you to start the day with full AP plus overflow