Gen set running for 4 days in a row

Going to a FMCA Ralley next month and got full Generator for the 4 day event. I have done the 7.00 am till 11.00 pm before but for health reason I have to have it 24 hrs a day. My question is every year I change the oil and filter in July and was wondering if I should wait till I get home to change it or go in to the Event with fresh oil and filter. I do not use mine verry much mostly going down the road running the house AC.