Believe the first one arrives in Dubai on the 20th......
I believe that would be me!!
......I fly from Manchester on the 20th.
Got my contract through around 24th April, after booking my medical and dental appointments (3 weeks after the 24th due very busy medical centre). It then took around 4 weeks for the results and forms to reach Dubai....Only then can Dnata process the visa application for you.(around 1 week).
It may be a quicker process for others but if I were you I'd get the dental & medical booked asap after you have the contract!
Good luck & see you guys in the sun!