Won't start :(

I'm going to look at car tomorrow but thought I would throw this out tonight and get some feedback. 65 Dart mild 318 with 904 floor shift always been super reliable. We went for spin today got home shut car off in front of garage, cleaned off some bugs did some grilling with beer :) Went back out to put Dart in garage and nothing! not a click, nothing. I have headlights, radio works so not the battery also I have no ballist resistor so it's not that. Starter or relay, would neutral safety switch cause this? Anyway I'll get under it tomorrow and have a look see but thought I would put it out there tonight and see any suggestions from the masses, thanks.