If, for some reason, you decide to ask Siri what Jewish holiday is happening this weekend (Yom Kippur), she will reply that the next Jewish holiday is her own birthday.
The glitch, first noticed on Reddit, appears to be a shortcoming in the system not knowing that although Yom Kippur began on Friday, Oct. 3, it ends on Saturday, Oct. 4.
Technically, then, it is still occurring this weekend.