Glad you like it.

There is no date. It relies on the number of blocks created on the STEEM blockchain. It is also not annual. Instead it is reduced by 0.01% every 250,000 blocks created . It happens about every 2 to 3 weeks. The actual printing of the STEEM happens each block which is every 3 seconds. However, it is not liquid yet after printing. It first goes to the voting pool and then it is rewarded when the people are upvoted.

In short, there is no reason to convert as a result of any jump in liquid STEEM because that doesn't happen from inflation. It might happen for other reasons such as a mass power down or sudden interest for many to power up.

For instance, if there are many users getting accounts and most of them are buying up STEEM to power up, there will be a shortage of STEEM which could drive up the price of STEEM.

Also remember that Liquid STEEM and SP are the same currency. The only difference is that SP is STEEM that is in long term storage. It is that long term storage and the desire to benefit from rewards of SP ownership that could cause a shortage of Liquid STEEM.