Well I just asked a few people around here with me at the moment and it was suggested that as it is a long way to travel for you to get to this meeting, you could take your uniform with you and if you have to you can get changed at the venue? This way you are safe and you wont make an a$s of yourself as one of my friends here has done, in the same situation as you are today, he ended up the only one turning up wearing his uniform, the rest just ordinary clothing and to this day they are pulling his leg re wearing fancy dress and all that.
Dont stress out, its not good for you, hope all goes well.
Karen