If unsure about committing, just reply Yes and put a "Maybe" in the comments box. (If interested in the drink afterwards, please also leave a message when replying.)
Reminder to not park in the Library lot on Mondays or Fridays. I suggest Ralph's (off Maxella) at 4311 Lincoln (there is a walkway in the back of the store that connects to Admiralty Way --it's about 1-2 min walk to the library). Or use the pay lots nearby.
Start your weekend with a fun evening of exercise and socializing.