Here are a few tips for the role of Hot Seat
The Hot Seat is available to perform any role that is not filled at the start of the meeting. The Toastmaster or General Evaluator should request the Hot Seat person to perform a duty prior to beginning the meeting. You should come prepared to full any role that your may be called on to perform.
Be prepared with text for the roles of Table Topic Master, Grammarian, Indicator and Joke Master.
It also would be a good idea to have a speech prepared before the meeting in case a speaker slot is available. Although, it is understandable that it takes time to get prepare for a good speech and you may not have one ready. This is totally acceptable.