Unfortunatly there is no safe, there is only the amount of risk you are willing to assume and the amount you are willing to pay (money, resources, and convenience) to protect your assets.
Protection has cost. Assets have value. And threats are variable. The basic security equation is: Risk = threat x vulnerability x exposure.
The risk is to your assets, so I'll make my best guess as to what those are.
Assets:
personal Email acount, work email account, web site accounts, online social identity, online game accounts, personal mobile phone account, work mobile phone account, personal voicemail account, work voicemail account, work IT accounts, integrity of personal laptop, integrity of home desktop machine, personal financial accounts (checking, savings, investment, retirement).
Threats:
For your question the threats are attendees at the conference. Threats are motivated by different goals, have different levels of skill, and different assets to use against you. You face different types of attacks from mischievous and malicious threats.
Vulnerability:
Just by patching and keeping your system up to date you greatly reduce the number of vulnerabilities in equipment. A threat (person) need to either know about or discover a vulnerability to use it in an attack. It is far easier for threats to use known vulnerabilites and find systems that have not be updated or patched than to discover new or not generally known vulnerabilites. Just know that you can never eliminate all vulnerabilites, but you can eliminate the ones for which patches and updates exist.
Exposure:
This is the area where you have the most control but it also costs you the most in terms of convenience and other resources. For example by not using your e-mail you reduce the direct exposure of your e-mail account to zero, but the cost is reduced convenience and resources for communicating. Instead consider how and when to use your e-mail. For example, you might want to protect the confidentiality of your work e-mail by only accessing it when no one can see your keyboard or screen (your hotel room), and when you have a network connection to a trusted network connection (authenticated encrypted national/regional ISP, as opposed to unauthenticated public unencrypted WiFi).
Web browsing
Consider installing multiple browsers for different purposes. I personally use Pale Moon Portable with very restricted capabilities for more confidential browsing. I would also suggest adding a separate account(s) with little to no personal data to use when you need to prevent information leakage.
E-mail
Similar to web browsing, consider installing multiple e-mail clients with different configurations and createing separate account(s) to isolate the information available when logged into a particular account. The Bat! is a popular mature e-mail client. Consider updating your passphrases/words after returning from the conference.
Social networking
This one really depends on how you value these accounts and what information you wish to be confidential. Consider updating your passphrases/words after returning from the conference.
Online gaming
Unless any of your gaming accounts is tied to financial assets, with online gaming I think you are only likely to see attacks from mischevious threats: i.e. cheating, distraction, and annoyance. Consider updating your passphrases/words after returning from the conference.
Personal & work calls & SMS.
Consider taking both phones: personal and work. Before leaving for the conference make sure you have a strong passwords on your accounts and that a PIN or password is required to access voicemail or account information even if calling from your mobile phone. Most mobile phones allow you to forward calls to another number which could be your hotel room or your other mobile. If you are concerned about the vulnerability of your smartphone then you can turn it off (all the way off, remove the battery if in doubt) when you are most exposed: i.e. a presentation on mobile phone hacking. When you return from the conference consider chaging your voicemail PIN or password.
Remote access (RDP w/ NLA) to personal & work computers.
You probably want to have minimal exposure when accessing remote personal and work computers, because with this activity you are putting assets not normally vulnerable to conference attendees at risk. I prefer when noone can see my screen or keyboard and I am connected to a trusted encrypted authenticated network.
Note: I have no affiliation with Pale Moon or The Bat!
