If you are absent a day, sorry, a deadline is a deadline. Your assignment presentation is 3/23. If you are absent on 3/23, be prepared to present when you return.
You will have Tuesday in the computer lab, Wednesday in the classroom and Thursday and Friday, you have your choice to work on your surprise element or on a computer. If you have the computer on Thursday, you may have to let someone else use it on Thursday - depending on demand.
Don't forget Thursday is collar for a dollar so you may not have time in class to work on this! Use your time wisely - you will have to work on this at home!