The duration of the festivities on the number of days that the community needed to achieve the goal. So: the faster you collect the irons, longer will be the Festivities.

So we will no longer to get horse shoes through the grand prix?

if the gifts in SR promo are on the same spot as for everyone?

While it seems the only way to get Altair will be to transform a horse into him - one image that was found mentions you can win his tack from the Lottery.



The bottom note on the page translates to:

When the Festivities start, you can get Altair's equipment:
In the Lottery
In the Golden Fleece

There has also been mentions of an 'Altair pack' - which I assume might be the top prize for the lottery/something that might be found in the Golden Fleece which contains all 5 pieces (again, just me speculating).

It's possible in the future that there might be a Sales event and the 'Tack Packs' for these Divines are sold in the Black Market - so that people can transform their own horses...but at present time, the only way to get the Tack will be in the Lottery or Golden Fleece

While everyone will have the same size Gifts in the same spots on their boards - what you find in that gift will be random. Take this shot of the Final Board;

Everyone will have a Large (Green) Gift in the Lower Left hand corner of the board - everyone will find something different in it. You might find a 5th Element, I might find a Nyx Pack, someone else might find it contains a Hestia's Gift for them.

Though I hope that is true - that would be awesome to get double diamonds for a "week"

And that's if his 'perk' would work if he was purchased by a player who doesn't have all the Rainbow Divines.

Ex. a player owns Red, Orange, and Yellow only.

If they buy a Secret Rainbow - will they get double diamonds on the first Monday, Tuesday, and Wednesday? Or will his perk not work because they lack the full set?

Ah well, guess we'll have to wait for a better indication of his powers

Secret Rainbow is one of the Horses of the Rainbow

Every 1st of the month at update time, it offers a 5th Element provided its owner connected the day before.

By bringing together the 7 horses of the rainbow, you can obtain Secret Rainbow

Game: 1 5th element offered on the 1st of the Month

VIP: Able to cultivate up to 10 fields at a time (?)

Regular text; pouvoir mettre en culture jusqu'à 10 près à la fois

Translations:
Able to cultivate close to 10 at a time
be able to put in culture until 10 near at the same time
to be able to put in culture up to 10 close at the same time

All of them seem to mention 'culture' and/or 'cultivate - both of which refer to the planting of crops. This is why I think the perk is most likely something to the extent of able to have 10 fields of Crops growing simultaneously.

I want to know how many rolls you get when you buy a packet of rolls? i remember from last time there was 3 rolls and i want to be sure that is correct.

Those things being that;

Whatever perk he offers for everyone will be a once a month deal
He can be sold
That Secret Rainbow is Male

So it's possible one of them is the truth - but as has been said many times before - until either more information is uncovered and/or we actually get him on the game...we won't know for sure.