It's not unusual for an activity to take place on specific dates or for you not to want to publish them and put them up for sale immediately after they've been created (e.g. you prepare summer offers in winter and don't want to make them public until spring).
There are two possible scenarios:
1. Your formula is visible and bookable all year round
You don't have to do a thing: all you have to do isregister your Formula. That's it! It's on sale: Congratulations!
2. Your Formula is based on different dates
Click on Define special dates
Set the publication dates for your Formula (its online visibility)
Thenset the possible booking dates for your package
You can create a package that can be booked from 1 July to 31 August, but only want to publish it (make it visible on your booking engine) from 1 April.
Now that we've finished, why not share all this on your Facebook page?