Unfortunately, I don't know the answer to your question. I think it's important to mention, however, that it'd be a good idea for you to alert FIRST of any potential problem you'll have in providing payment. I know that things have changed in recent years as FIRST has grown, but I also know that they have been understanding of these sorts of situations in the past. I, on behalf of a team, received a call from them one year asking for $10,000 or so. They understood that I couldn't give it to them, but that it was coming.
