Long story short - until about 6 months ago I worked in an office next to another department, always got along with the staff in there, went to their xmas parties, nights out etc. Then they were relocated to another building in our site. So I don't see them as much now, invitations to nights out dried up completely, they were all pleasant if they saw me but that was it.
One of the girls is now about to go on maternity leave - I was asked to contribute towards a gift, which I did, signed her leaving card and was told last week there would be a leaving do for her this afternoon. Said I'd come along.
So this morning comes and I've heard nothing. Tried ringing 2 different numbers in the department and sent an email but no answer from anyone. Too 
to go along to their office and ask what's happening about times/venue etc and now I'm feeling a bit stupid. I even put on some nice work clothes this morning for a change.
What do I do? And I realise I should be working before anyone asks 