I planned a yeast starter 24 hours ahead of my brew day, it ate up all the started and fermented just fine… but brew day came and all of a sudden my free day became very busy and I was unable to brew as planned… i do plan to do the batch this coming weekend so if i put my yeast back in the fridge should i be okay?
Yes, it’ll be fine. Just chill it for a few days in the beer it made, then do a new starter as usual when you have your next brew day. If it’s going to be longer than a couple of weeks should ideally decant the beer and replace it with sterile water, but even if you didn’t it would most likely be just fine.
Should be OK, stick it in the fridge, and you can just pull it out a week later and dump it in.
HOWEVER, for the least lag time, dumping some fresh wort on the yeast a day or two before brew day would be a good idea. It is always nice to catch the yeast at their peak!!