Concerning visiting Fifa reserve

Esteemed people of the RSCN,

we are three friends from the Netherlands that are finally able to visit beautiful Jordan from the 7th through the 16th of May this year. During our trips we have a focus on enjoying nature and spotting the local wildlife. Ofcourse, getting to know the local culture and history as well is important.
I myself have a bit more focus on birdspotting, while my friends, Rob and Gerjon are more interested in the herpetofauna. In both groups are some more night active species we would like to find. Since Fifa reserve seems to be the best place for Nubian Nightjar but it is close to the border with Isreal,
I am wondering if it is possible to arrange a visit to Fifa reserve on 13, 14 or 15 may, evening/night to go looking for birds, especially Nubian Nightjar and have a chance to find some night active lizard and snake species.
I don't really know if this first half of may is possible to find the nightjars there. I hope so.
I am working in CITES enforcement in the Netherlands as well, so from that perspective it would also be interesting to meet. 
I hope to hear from you.

Greetings,
Maykel van Gent