I was just nosing around on OddsPoker (OddsMaker Poker)
at the freerolls and noticed a little "pencil icon" to the right of each tournament in the list.
I thought perhaps it gave more details of the tournament so I clicked the icon to have a nose and I have to say I was pleasantly surprised.
As you can see from the image, you have the option to add it to your preferred "mail" calendar.
If you think this would serve as a handy reminder to you, just head on over to OddsPoker
and click on Tournaments.
Click the pencil icon next to the tournament you would like to be reminded about and then add it to your preferred mail calendar.