It can be safe. If there is no BDSM play involved it is no different then a regular blind date.
If you are going to play there are typically a couple of good guidelines.
Firstly a buddy system. Before playing you tell your date you have a friend that if they dont hear from you every x hours (something like 3 hours would be good) will phone the police.
You also do not want to have stricter forms of bondage. So do not let them tie you to an object. If you hands are just tied to each other you still have a lot of mobility.
And then communication. Make sure they are educated, know what is safe and what is not safe, make sure they use and follow a safeword.
With those guidelines it is quite safe to have a kinky blind date