Lit

Exceptionally exciting, enjoyable, or full of lively energy.

Reach for it when using current informal praise for a social event or performance, not for serious evaluation

The final dance set was lit, and even the ushers joined the encore.

• playful

  buzzing

  a place feels busy with anticipation and conversation

  not when Buzzing describes the surrounding scene more than the performance itself.

• playful

  on fire

  someone is performing exceptionally well in the moment

  not when The idiom is ambiguous around real danger and too casual for sober reporting.

• everyday

  exciting

  the experience creates strong eager interest

  not when Exciting is neutral enough for formal contexts and lacks lit's social slang tone.

• everyday

  lively

  animation and activity are clearly present

  not when Lively can be pleasant but modest, falling short of lit's intensity.

• warm

  electric

  shared energy seems to charge the room

  not when Electric describes atmosphere and may not mean the event was uniformly excellent.

• professional

  excellent

  quality deserves direct, broadly understood praise

  not when Excellent says nothing about excitement or crowd energy.

• dull
• flat
• lifeless
• boring

• absolutely lit

  The community hall was absolutely lit during the brass band's finale.

• party was lit

  The party was lit once the grandparents started the first dance.

• keep it lit

  The drummer's playful solo helped keep it lit through the final song.

This positive sense is slang and shifts quickly; lit also has standard senses related to light and literature.