Disneyland Paris is openings its gates again to guests on July 15. Today the reservation system for Annual Pass holders and non-dated tickets became available, and while browsing the availability, it can be seen that for Annual Pass holders, you can also choose July 13 and July 14 as dates to visit the parks. This is before the Park opens to the general public. You can read this article for more information about the reservation system and book some days yourself.
On both July 13 and July 14, Disneyland Park is open from 10am to 8pm, and Walt Disney Studios Park from 10am to 7pm.