If you plan on going to Madrid next March (EMACI) or Alicante in May (EMACNS) you are advised to book your accommodation as soon as possible.
Both locations are showing high demand on the various hotel booking websites. You can reserve accommodation for free or for just one pound on a variety of websites (ie: Booking.com, Alpha Rooms) without incurring a cancellation fee should you later decide not to travel.
The entry system of both events will open shortly which will further increase the demand for rooms.