1900 The first automobile show in the US opened at Madison Square Garden in New York. The week-long event was organised by the Automobile Club of America. Spectators paid 50¢ each to attend the event

That was a big price for admittance to something showing for the first time. I'll bet it was a huge success. I would have paid it, happily. I love car shows. Here's what I found...$50 in 1900 is equivalent to approximately $1,928.43 today, reflecting a cumulative price increase of 3,756.86% over the years due to inflation. This means that today's prices are significantly higher than those in 1900, illustrating the impact of inflation on purchasing power.
U.S. Inflation Calculator