I am familiar with the adage, THIS TOO SHALL PASS (from the first words of the four theme answers), - it reminds me of my Mom, in fact, who uttered it with some frequency - but not only did I not know the source, I don't think I've ever even heard of ATTAR as the name of a person before ("Sufi poet thought to have coined the adage"). The second-to-last letter of the revealer was a touch-and-go Natick for this solver due to the classic conundrum, PTo or PTA? In an effort to prevent casual FWOEs, when I come to clues like today's "School fund-raising grp." and others like "Traveler's approx." I try to remember to leave the final letter blank until the answer in the other direction shows me which way the wind is blowing, but when both options are possible, a voice in my head says, TOOBADFORYOU. :)
I had only one other clue-related trouble spot. At 25A: for "C-worthy" I started off with 'soso' instead of the correct OKAY. The only other slow downs were caused by my poor typing on a touch screen device. How many times in a row can a person type Z instead of A??? Turns out, it's a HIGH number.
Anyhoo, on to more HAPPY things. I enjoyed "Revealed accidentally" (LETSLIP) and "Good name for a financial planner" (IRA) was a JOKE that was the cause of a little laugh. I also really like, for some reason, PAT as a unit of butter. ERUPT is a great word, and SHAM is fun. Also - PARTYBUS - sign me up! I'll be the first to say THISONESONME. :)
OTOH, I found SEEP for "Percolate" a bit odd. Also, OBIT for "In memoriam piece" seemed a little strange, not because the clue and answer don't match up, but because there's no indication of an abbreviation in the clue, which seemed unusual for a Monday. But, maybe OBIT isn't considered an abbreviation anymore.
All in all, a pretty fast Monday for this solver (5:26), but the under-five-minute solve continues to elude me. EAU well, MAYA next time.