A quick question about postal matches

HI folks. I've thought of shooting a postal match or two , for some time now. For some reason , I thought each match had to be shot at a specific time or month in the year. Looking at it closer, it looks like that's not the case? I guess what I'm asking is, can I shoot say, November and December's match in June ? Making sure targets are in on time , of course. Would make a great weeks vacation on the range. Thanks, Loco.