RE: enough rain to grow?
yep - what timber said.
It would have bee better if the seed was at least pressed into the soil before the rain, or lightly covered - but don't do it now.
Most should germinate fine, the question is, will it get a chance to get established before the next rains? Hope so. An extended drought could render the polot thin - since its not covered.
Fertilize 2-4 weeks from now - only if the plot managed - and is stablished well.