Gathering Spots?

[Barbara]

In addition to the suggestions above, here are a few more.

Several Tuesdays a month 5 p.m. at the Hotel Maria Cristina Boutique Hotel on Calle la Presa (opera & cine eclectica, discussions), all in English.
Come about 20 minutes before for a glass a wine; people usually scatter afterwards for dinner.
Several Tuesdays a month at Foro Cultural 81 on Positos #81 - films, music, lectures
Wednesdays once a month (usually the last Wednesday) 8 p.m. at Hotel Boutique Casa Dioniso, live music with drinks and snacks afterwards, a
good place to mingle and meet people.
Saturday evenings around 9 p.m., live music at the Union Bar at the Maria Cristina Hotel - no cover, good music, small but nice bar
Sundays at 1 p.m. in the Museo Gene Byron in Marfil, concerts, usually chamber music, classical or jazz. Afterwards wine and snacks are served, another good place to meet people.

Karen Yee used to have a meet-up group but that ended last October We have a facebook page Guana What where we list all these events and more.

ADDITION TO MY COMMENT ABOVE:
Another suggestion: enroll in a Spanish class and you'll meet visitors and residents from various countries. The language schools also offer other activities and trips for their students.
I agree with Don Juane's and jesm's comments above. Many expats who live here are into their own thing. You can expect to see some expats at these places when they have time to spend with friends or family, but they aren't really meet-up spots like you'll find in other towns.