Changing nap time?

I realized we have DS's 1st birthday party planned for April 1 from 1-3pm, nap time. Since we have a few weeks, can anyone recommend how to change a child's nap time? Here is his schedule of 3 naps a day:

9:30-10:30/11
1-2
5-6 (some days he skips this one)

Can it be done? Should we aim for 2 longer naps?
Any advice would be great. TIA

Re: Changing nap time?

For that particular day I'd try to hold his morning nap off until about 10 (or even later if possible) and assume he'll crash immediately after the party (or possibly even earlier - parties are exciting ) and take 2 naps that day.