Talk:Summoning/@comment-190.2.111.51-20180317092544/@comment-77.221.38.233-20180318101708

Sometimes they have their own servant pools (I don't know how often). The best example for this was the Valentine's event summoning banner with only female servants available (and the CBC with only male).

You can check out the exact servant pool in the summon info. It lists all the servants and CEs with increased drop rates, as well as all the other servants and CEs available.