Yes, I have contacted Bittrex and other exchanges. I suggest for everyone to email the exchanges you want to see Lightcoin listed and also use their twitters.

Follow Lightcoin twitter @ https://twitter.com/Lightcointweet

Bittrex:
Follow their twitter and tweet them and asking to add Lightcoin market @BittrexExchange
Send them a ticket: https://bittrex.zendesk.com/hc/en-us/requests/new
Contact Bittrex owners here on Bitcointalk: richiela, Bittrex-Bill, Bittrex-Rami
Post in Bittrex thread: https://bitcointalk.org/index.php?topic=463202.0

Poloniex:
Send them a ticket to add Lightcoin for voting: https://poloniex.com/coinRequest
Send them a ticket to add Lightcoin market: http://poloniex.freshdesk.com/support/tickets/new
Contact Poloniex owner: busoni
Follow their twitter and tweet them and asking to add Lightcoin market: @Poloniex
Post in Poloniex thread: https://bitcointalk.org/index.php?topic=420836

Mintpal:
Ask them to add Lightcoin for voting: support@mintpal.com

There are other exchanges which follow the same procedure so please feel free to suggest Lightcoin to them.

Thank you for the support.