My suggestion is for the August event.
Now, we need to collect points personally to get the shops open.

But this also brings a problem to light.
Many people will want to take a look at both shops and spend their event currencies on items they want.

However, due to the personal bar, you need to collect 300 points to get one shop open, then collect 600 points to open the other shop. That means 900 points in total.

With the frequency of the event choices in explore and the amount of points they give, I believe one should not expect most players to open both shops in one event.

So I suggest a helping item.
I havent named it, I dont have a picture of it. But it would be in both shops, it would cost some event currency and would reset the player's points to 0. So they can open the other shop easier.

I know we are at the very beginning of the event but honestly... I have been on all day and only have 25 points so far.

Hope you liked my suggestion.

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Some important points:

1. I see this as being a bit like June, July or October events. You get to chose a path and and it's costly or you just can't switch.
The June event was fairly new with a lot of new items. They have allowed us to switch between shops and get what we needed for our event currencies.
The July event didnt have a specific shop for the choices we made. It had one big shop where we could spend our event currency.
In October we did have a shop specific for the choice we made but dont forget that we had the option to purchase 'Oblivion' from both shops, which acts as an item I am suggesting. It allowed you to access the other shop.

It's costly to switch most will stay with only one path encouraging trading.
It is all nice and good, however not knowing what new items will be added to the shops makes this part very difficult. Most people might end up being forced to stay to one path indeed -not because they want to but because they cant switch- but maybe this path is not what they wanted from the event. In the end, getting what you want -when new items are added- is not the question of choice but the question of luck.

UNLESS they hurry up and update the Wiki with all available items at the very beginning of each month, then we need the item to switch shops more easily.