3B1 expresses question about the celebration, without a doubt expects it not to happen. 3B2 expresses uncertainty, it'd or might not happen. 3B3 expects that it'll come about. I almost never see any with the four versions mentioned in the initial post. All four of such variations are ideal. 1 https://socialexpresions.com/story5818432/5-simple-statements-about-best-aquarium-shops-dubai-explained