Bluebird,
The only thing i'd suggest is calling them as early as you can in the morning. They may have a lot of messages for them over the weekend and may not get to yours that quickly. Try giving them a ring at say 9am and see if you can sort it out with them then. They'll have all the info to hand regarding rearranging third stage, and im sure they'll be able to give you a date that suits you and also isnt too far in the future. In terms of the travel arrangements, they should be able to help you rearrange all that as well.
Hope it all goes ok, good luck.