Difficult to say I'm afraid, we will know more after this weekend. I would expect a prompt announcement next week.
April 16/17
April 23/24
April 30/31
May 7/8
May 14/15
Are all open weekdays. city will be home in the champions league on April 17, so it won't be then. If they win, they will then be home on the 7/8. 30/31 april is a champions league night and I know generally domestic games don't go up against european ones (uefa rules) - but they could still do so by manipulating the kick off time
One of those midweeks one will be the Sheffield United as well. If I was to have a guess, I reckon the last midweek (May 14/15) is nailed on for one of those two games, and probably the 23/24th April. Truth of the matter is though unfortunately we don't know for sure - and as you're travelling I would hold off till this weekend shakes out.