There are not a lot of specifically “dual-purpose” days in the church year. There might only be one, today. Today is Palm/Passion Sunday.
I think I might have mentioned, in one or the other of the sermons, the futility of fulminating against the lazy society we are in with “no one” attending Good Friday services anymore. The committee that put together the Revised Common Lectionary realized this futility and instead created the hybrid of Palm/Passion Sunday as a way to ensure none of the essential elements of Holy Week would be missed. I, personally, am okay with the combined day.
One of the things I hope I was able to get across in the sermons is how confusing days are not the exception but the norm. Give one or both of the sermons a listen and let me know what you think.