Final answer:
The Ivanhoe Hotel's opening date isn't specified in the provided excerpts, which suggest a literary context for the question, focusing on events mentioned in a fictional narrative.
Step-by-step explanation:
It looks like you are referring to a possible event mentioned in a work of fiction or a passage in a book where the Ivanhoe Hotel is implicated. The textual excerpts you've provided do not specify the opening date of the Ivanhoe Hotel, instead they mention a "summer bobbing party" at the Sevier Hotel barbershop and a family staying at a cheap downtown hotel the night before a wedding. This suggests that the context of your question is literary rather than historical or factual. If we're discussing a book or a literature class, it would be crucial to analyze the significance of the Ivanhoe Hotel within the text and to explore how its opening ties into the narrative or the characters' development.