How festivals became multi-day events
Launch library · evergreen read

Early festivals were often confined to a single day, shaped partly by practical limits on travel and accommodation that made a longer gathering genuinely difficult for most attendees to manage without significant disruption to their ordinary working lives back home during the rest of the week.
As transport and camping infrastructure improved considerably over time, organisers found that a longer format allowed for a far more varied program, spreading acts across multiple days rather than compressing everything into a single, exhausting stretch that limited both audience numbers and lineup variety considerably.
The multi day format also changed the fundamental economics of festivals, since attendees committing to several days generate more revenue per person through accommodation, food and merchandise than a single day event ever could. This shift helped fund the larger productions modern festivals are now generally known for. Building this into the routine from the very start makes it far easier to sustain across future events.