Unfortunately you're limiting your options. Basically the only way folks can send you money is if they have also have PayPal Accounts. That's OK as long as everyone is aware of that requirement. All they need is the email address associated with your PayPal Account. Having that address, they can send you the funds.
It's very important to understand that this method may raise some red flags. If you have a Personal Account, there are limitations on receiving funds and if PayPal sees unusual activity, they will lock your account. You will not be happy with that scenario.
A much better method would be for you to have a Premier or Business Account, then use the Invoice Tool to send request payments to those attending the meeting. The attendees can then pay with a credit card or open or pay with their PayPal Account. Now you're using the system as intended.
Regards,
skier
