Many speakers will agree to attend a special event at no additional charge. Some will not. It is important to make your requests known in advance and include this in the contract.
As a rule, my investment structure is for 24Hrs or part thereof. It has been known for me to host a VIP breakfast prior to the event, a FAQ luncheon during the event, provide a ‘snap shot’ presentation, a 90mins keynote, a breakout workshop and a webinar interview in a day! You’re investing in me to support your event, how you best make use of that is entirely down to mutual agreement.