Starting today the broom will only allow entering 2 shows at once.
Also the scroll of show creating will allow creating 2 shows.

However, to compensate, the number of xp you get for entering the shows was increased.

The new numbers are:
Entering one show went from 10xp to 25xp
The rider xp bonus went from 5 xp to 12xp
The equilibrium xp bonus from 3xp to 7 xp

After the tomorrow's shows, the amount of xp you and your horse get from show results will also be increased.

Other changes:
Manufacturers get 250xp for making one tack instead of 100xp and 170 for repairing tack.
Trainers and Riders get 2500xp instead of 1000xp when they feel 'more experienced'
Stablehands and Vets get 2.5times more xp for their work

So, if you had a broom before the change, you were getting 5*10xp = 50
Now you will get 2*25xp = 50.
If you were a rider you were getting 5*15xp = 75xp
Now you will get 2*37xp = 74xp
If you were an equilibrium you were getting 5*13 = 65xp
Now you will get 2*32 = 64xp
As you can see, the changes will not affect your level advancement.

Conclusion: For most players this change means it will be easier to advance levels.