latecomer
noun /ˈleɪtkʌmə(r)/
  /ˈleɪtkʌmər/
- a person who arrives late
- Latecomers will not be admitted until the interval.
 - They made space at the table for the latecomers.
 
Extra Examples- He was something of a latecomer to the band.
 - The presentation was interrupted by latecomers drifting in.