There is a civilization out there that has developed FTL travel and at one time visited us quite regularly.
They don’t any longer. They still have plenty of dilithium crystals but their ‘progressive’ politicians have banned the mining industry. It was contributing to dirty fingernails - you can just imagine what an eyesore that was.
Anyway, their latest flight to visit Earth will be somewhat delayed. Their light-sail is a bit slower than the dilithium crystal drive, though otherwise a great alternative.
They will next arrive in 100,002,208 AD...