| 1TC | 1(First) Treasury Convention | |
| 4WWF | Fourth World Water Forum | |
| 4YFN | 4 Years From Now | |
| AA | Active Annual | |
| AA | Average Attendance | |
| AAAC | All Africa Anesthesia Congress | |
| AABC | Advanced Automotive Battery Conference | |
| AABF | Africa-Asian Business Forum | |
| AABF | Albuquerque Antiquarian Book Fair | |
| AAC | American Athletic Conference | |
| AAC | Appalachian Athletic Conference | |
| AACC | All Africa Conference of Churches | |
| AACC | All Asian Creation Conference | |
| AACL | Anti Aging Conference London | |
| AACL | Anti Ageing Conference London | |
| AACSS | All Africa Conference Sister to Sister | |
| AADC | Advanced Autonomous Drive Conference | |
| AAFC | All-America Football Conference | |
| AAFC | All America Football Conference | |
| AAFC | Asian American Footsteps Conference | |
| AAFC | All American Football Conference | |
| AAFC | Atlantic Africa Fisheries Conference | |
| AAIC | Alzheimer’s Association International Conference | |
| AAMF | Avoyelles Arts & Music Festival | |
| AAOC | Annual Affiliate Officers Conference | |
