Do you mean the imserso scheme? This is a reduced price holiday scheme for resident pensioners and you have to sign up to do it. The dates for registering this year are June 25th to July 10th so you will have missed out for this year's lot.
However, if you had already registered last year or earlier, you did not need to re-register this year and should get a list of holidays which you can choose from sent to you.
You complete the application on line but some travel agents, I believe the one next to Rosa's do it, will complete it for you.
The application form is here at
Imserso ApplicationsAnd the full explanation is at this site
Imserso CriteriaThe holidays are available from October to June and are subsidised by the Spanish government.
The local town hall also sometimes have special deals on reduced price holidays so maybe this is what you mean by local? You can get information at the town hall in Rojales and check the notice board for upcoming events.