Sunday CALENDAR SECTION only of the Los Angeles Times, Feb. 14, 1999 

* Detroit rapper EMINEM album release party
* "Slim Shady" hip-hop - horrorcore rap music 
* Record label "Aftermath Entertainment" - Dr. Dre  

Often revered as the undisputed "bible" of Hollywood, the Sunday Calendar section occupied a rare space in journalism where a single publication could simultaneously dictate global entertainment trends and govern the inner workings of show business. Today, physical copies are an absolute rarity, largely because they were printed on standard, ephemeral newsprint designed to be devoured and promptly discarded at the end of the week.
Page 68 has a advertisement for upcoming events at the "House of Blues" with one for a Feb. 23 appearance by Detroit rapper "EMINEM, The Slim Shady Record Release Party" (see images) His album would be released the very next day of this party date. 
I suspect this to be an extremely rare item because their was really no reason to save it at the time.
Complete Calendar section only with all 86 pages, tabloid size, nice condition.

Background: The intersection of this newspaper advertisement and the subsequent House of Blues performance represents the exact flashpoint where the underground rap circuit collided with mainstream pop culture, marking the birth of a global phenomenon. In February 1999, Eminem was still a volatile gamble for Interscope Records, making this localized promotional push in the Los Angeles Times the music industry's official, high-stakes invitation to witness Dr. Dre’s latest protégé before the rest of the world caught on. The release party itself served as a historic, intimate proving ground—a $10 showcase where Marshall Mathers transformed his raw, counter-culture alter-ego, Slim Shady, from a polarizing mixtape artist into an undeniable commercial force on the literal eve of dropping a multi-platinum masterpiece. Together, the artifact and the event capture the final, fleeting moments of anonymity for an artist who was about to permanently alter the sonic, cultural, and political landscape of modern music.