In the summer of 1994, the original lineup was:

Mondays - "The Mary Tyler Moore Show" on "Mary Mondays"
Tuesdays - "I Love Lucy" on "Lucy Tuesdays"
Wednesdays - "Bewitched" on "Bewitched Be-Wednesdays"
Thursday - "I Dream of Jeannie" on "Jeannie Thursdays"
Friday - "Dragnet" on "Sgt. Joe Fridays"

In the summer of 1995, the lineup was:

Mondays - "The Munsters" on "Munster Mondays"
Tuesdays - "I Love Lucy" on "Lucy Tuesdays"
Wednesdays - "Bewitched" on "Bewitched Be-Wednesdays"
Thursdays - "I Dream of Jeannie" on "Jeannie Thursdays"
Fridays - "Welcome Back, Kotter" on "Kotter Fridays"

For the summer of 1996, the lineup was:

Mondays - "The Munsters" on "Munster Mondays"
Tuesdays - "I Love Lucy" on "Lucy Tuesdays"
Wednesdays - "Bewitched" on "Bewitched Be-Wednesdays"
Thursdays - "The Odd Couple" on "Odd Couple Thursdays"
Fridays - "I Dream of Jeannie" on "Jeannie Fridays"

For the summer of 1997, the lineup was:

Mondays - "The Monkees" on "Monkee Mondays"
Tuesdays - "I Love Lucy" on "Lucy Tuesdays"
Wednesdays - "Bewitched" on "Bewitched Be-Wednesdays"
Thursdays - "Happy Days" on "Happy Days Thursdays"
Fridays - "I Dream of Jeannie" on "Jeannie Fridays"

n the summer of 1998, the lineup was:

Sundays - "I Love Lucy" on "Lucy Sundays"
Mondays - "Laverne and Shirley" on "Laverne and Shirley Mondays"
Tuesdays - "The Brady Bunch" on "Brady Tuesdays"
Wednesdays - "The Wonder Years" on "Wonder Wednesdays"
Thursdays - "Happy Days" on "Happy Days Thursdays"
Fridays - "Rugrats" on "Rugrats Fridays"

During the summer of 1999, the lineup was:

Mondays - "The Brady Bunch" on "Brady Mondays"
Tuesdays - "I Love Lucy" on "Lucy Tuesdays"
Wednesdays - "The Jeffersons" on "Jefferson Wednesdays"
Thursdays - "Happy Days" on "Happy Days Thursdays"
Fridays - "The Wonder Years" on "Wonder Fridays"

Finally, in 2000, the lineup was:

Sundays - "I Love Lucy" on "Lucy Sundays"
Mondays - "The Andy Griffith Show" on "Mayberry Mondays"
Tuesdays - "Gilligans Island" on "Gilligan Tuesdays"
Wednesdays - "The Beverly Hillbillies" on "Hillbilly Wednesdays"
Thursdays - "The Brady Bunch" on "Brady Thursdays"
Fridays - "The Party Crasher"

The following Fridays "Party Crashers" were revealed to be:

July 7th, 2000: "Head of the Class."
July 14th, 2000: "Perfect Strangers."
July 21st, 2000: "The Jeffersons."
July 28th, 2000: "Bewitched."
August 4th, 2000: "I Dream of Jeannie."
August 11th, 2000: "Head of the Class" (Was advertised as "My Favorite Martian")
August 18th, 2000: "Happy Days."
August 25th, 2000: "Rugrats."
September 1st, 2000: "The Wonder Years."

We didn't know how good we had it back then.

i miss the old NICK & Nite n TV Land

This was Nick At Nite when they did most known Block Party Summer blocks each Back in the mid to late 1990s and also in the year 2000.

Was the show called "Head of the Class" because Howard Hesseman was a pot smoker. As a young man he got into lots of trouble in 1963 for selling an ounce of pot in San Francisco and spent 90 days in jail and still coyly admitted to pot usage in his later fame.

n the summer of 1998, the lineup was:

Sundays - "I Love Lucy" on "Lucy Sundays"
Mondays - "Laverne and Shirley" on "Laverne and Shirley Mondays"
Tuesdays - "The Brady Bunch" on "Brady Tuesdays"
Wednesdays - "The Wonder Years" on "Wonder Wednesdays"
Thursdays - "Happy Days" on "Happy Days Thursdays"
Fridays - "Rugrats" on "Rugrats Fridays"

The Wonder Years had ended in 1993. What was it doing on Nick at Nite just 5 years later? Rugrats didn't belong there either. That was the beginning of the end for real Nick at Nite.

It's not that unusual for Nick shows to air on nick@nite. I was surprised to see Rugrats aired on nick@nite especially for 2000 party crasher Fridays. SpongeBob currently airs on nick@nite that regularly started 2018, and not counting for special themed ones that had nick@nite brand... in 2000s or something.

I recalled there was Looney Tunes on nick@nite before from 1989 to 1993
https://www.nickandmore.com/kids-tv-history/list-of-every-series-aired-on-nickelodeon/