Hmm...
I manage my boss' calendar. He's very busy and travels a lot. I spend a lot of time organising and reorganising meetings as things get arranged and then something else takes priority. This very often involves lots of other people internally and externally so I spend a lot of time going backwards and forwards to find suitable dates and times - not everyone keeps their calendar up to date. For every meeting, I usually organise a meeting room, set up dial in details for conf call/video conference/webex/organise lunch or teas and coffees.
For every meeting my boss attends I have to make sure he has the right paperwork (agenda, papers, actions, background papers) so if he is out of the office I have to plan ahead and make sure he has everything to take with him. I book all of his flights/visas/hotels/car hire/taxis. We don't have a lot of time to go through things so I tend to plan his life for him and will move meetings to fit in with schedule. For example, if he is going to Manchester on the 21st and his meeting in Derby on the 15th can delayed I will reorganise it to make better use of his time. I literally plan his life minute by minute!
I attend and minute several monthly meetings. This involves pulling together everyone's suggestion for the agenda, checking with my boss, sending out the agenda, minuting/actioning the meeting, typing up the minutes/actions, chasing everyone up for their actions. Similarly, when my boss receives minutes/actions I have to check if he needs to do anything and generally request information from his direct reports/HODs.
I pull together various reports for him including his monthly Chief Executive's Report. We go through it together using the previous month as a template and, again, I pull together information from his direct reports, reformat everthing and amend the grammar/spelling. In the same way, I produce PowerPoint presentations which very often involves pulling together information from various sources.
In conjunction with the Company Secretary and the PA to the CFO, I help to organise the AGM. The other PA and I also organise an annual event involving all of the companies within the group. Last year, the event was held in California. We're a global company so all of the guys were flying in from all over the place. They organise their own flights but we look after their accommodation, transfers. It doesn't sound overly difficult but it's a bit like herding cats!
To be honest, the list goes on and on.... I often have to help out the Chairman and Non-Executive Directors with various requests and ad hoc tasks. I print and bind reports and presentations. Do random internet research. Pull together financial information into Excel and make things look pretty. Meet and greet visitors. Make teas and coffees. Order lunches. Order stationery.
It's a bit like spinning plates at a million miles an hour. If everyone came back to me with answers/information first time my life would be a lot easier but I spend a lot of time asking for stuff and chasing. In the case of the global event, I also spend a lot of time booking and rebooking things like hotels because plans change/people change their minds/accidentally double book themselves/etc. Staying polite can be a challenge when you have changed a hotel booking for the umpteenth time...